When I first saw the boxes arrive to my home I was pleasantly shocked. They were definitely big as one would hope for them to be. I say this because I was paranoid as to what 4 X 10 would look like in person.I opened the box with a box cutter, let me add that I strongly advise you to open these with the utmost caution, given that the mat material is only covered by a thin plastic bag. If you use a box cutter, as I have, please only use the most minimal incision depth to avoid punctures to mat material.Upon removing the mats, the first thing I noticed was the Vinyl Material. It was very much solid in that it wasn't baggy on the mat like other folding mats I have seen before. The material was firmly fitted with minor slack in certain areas, which is normal with any vinyl mat cover. The vinyl was very supple and not abrasive like other mats I have seen.The mat has on each end a strip of Velcro, to attach other mats to it. They also have a convenient handle once folded for easy carry. Best part is they come with a 2 year warranty.I unfolded and laid down the mat on the floor and was shook by how much space they took up, even my brother commented on his concern if we were gonna have enough space for them.I took out the other mats and started to connect them. Connecting the mats isn't too difficult. There is kind of a learning curve connecting them. My suggestion is to have the mat you are connecting overlap the mat thats on the floor and then gently slide the mat in to place on the velcro flap.I bought 3 Mats which is definitely enough if you want to spar comfortably 1 on 1. I'd say get 4 Mats if you wanna spar 1v1 in an MMA fashion. 3 Mats is enough for 4 people if technique is the only thing being practiced and drilled.Anyway, once we connected them, I spent no time waiting to test them out.Test 1: My biggest concern in getting these mats was that the foam wasn't going to be dense enough to provide comfort during my rolls. Boy was I wrong. These guys are very firm. Not so much that it feels like I am walking on solid bare ground but enough that I can tell what I was walking on is cushioned. My feet did not sink in much, if at all, when I stood on them. I did a few break falls and did not feel any sort of discomfort. I would not suggest slamming someone on these mats but I would feel comfortable having a take down done on me with these mats.Test 2: My next biggest concern was that the Velcro would not hold when doing shrimping movements or pushing off my back foot for a double leg. The mats held up just fine with no issue. No moving around on the bare floor or separation. Should that be the case at any point, I can always add strips of Velcro to the end "faces" of the mats but so far I don't think I will need too.Test 3: Drilling. I'll be honest, I have yet to do a full out sparring session on these because the reason I bought them was to do the Gracie University curriculum with my brother. He is not in anyway experienced in Grappling, so we only did technique drilling. These mats were as comfortable as can be. I forgot I was even drilling in my garage. The material is perfect for Jiu jitsu. I can't fathom getting mat burn from the material. My back felt comfortable in guard and even when my brother was working his mount attacks on me.For cleaning, I suggest not over saturating the mats with your cleaning solution. So put the mop bucket away. The best way I have found to clean them is to use a spray bottle (I use a bleach and water solution) and dry mop pad. Spray and push the mop pad down the mat till solution is spread and thinned out. Allow to air dry and put the mats up (or leave them down, whatever, they're your mats)Overall I will give them the following ratings:Material: 8/10:They by no means feel cheap but nor does it feel super expensive either. It is adequate and then some. The vinyl is very comfortable and solid. The mat foam is very firm and absorbs impact like a champ (well as well as a 2 inch thick mat could). It is all you need and then some. In the future I will buy a vinyl tarp to put over it to increase the mat life.Build quality: 8/10:While some customers have reported issues with the seams coming upon receiving them, they are in the minority of the reviews and I have yet to see much quality issues besides the occasional thread sticking out. They don't appear to be loose but maybe just end pieces that didn't get cut. You really have to look for it, it is by no means noticeable or bothersome or even concerning. The 2 year warranty helps me sleep at night too. The handles seem adequate and the Velcro doesn't seem flimsy at all.Set up: 9/10I am not a fan of Velcro in the first place but to be fair this is just how folding mats lock, still way more convenient and comfortable than puzzle mat, set up isn't all that fun but they get the job done. While I prefer the ease in the Velcro setup that Gracie Garage mats used to have (Velcro on the flat ends of the mat), these seem to be more secure. Like I said, it is a learning curve but only a small one to align them just right. Taking the mats off and folding them is not too much of a hassle. Just pull the mat from the Velcro strip. I advise you to step or push on the fuzzy Velcro flap while you pull the other mat off to prevent any damage to the flaps. The mats fold up easily and the handle really helps transport them.Price: 10/10You seriously can't beat this quality and $ per sq ft anywhere else.Overall Score: 9/10:Best 235 bucks I have spent. Do yourself a favor and get them!