EDIT 2: emailed customer service at 9pm EST on a Sunday and they emailed me back already at 10pm and setup to send me a new charger and even let me keep the defective charger which is still useful since the USB-C has been working very well for me. Needless to say, the best customer service experience ever. The new charger got here within a couple days and this one's USB-A port works perfectly. Also bought a new amp meter and has been measuring the output of this charger. For my laptop, it hits 35 watts @ 20v & 1.75 amp which is what my laptop calls for. For my note 10+, the max i have seen is around 28 watts which sounds about the same wattage that the samsung 45w charger outputs. Also gone is the quirk that I mentioned where the charger does not seem to charge at full speed right away (see below). So to summarize, great great customer service and very good charger.EDIT: Finally had a chance to use the USB-A port and found it is dead. Nothing coming out of that port. Tried several cables. Will have to downgrade this a bit until I can see if manufacturer will replace itfirst of all, there is a big quirk with this charger. It will NOT charge at FULL speed when the phone is first plugged in, and will instead charge at half speed or something. (EDIT: I found out that the charger will start to charge at full speed after around being plugged in for 2 minutes if you do not disconnect and reconnect, but if you reconnect, it will charge at full speed right away. In fact, a few times my phone was already plugged into the charger and my car was turned off, after I started my car, the phone wasn't charging at all. I had to unplug and replug for charging to start.) Your phone will still say fast charging but the actual rate of charge is actually slow, around the standard PD rate of 3amps at 4volts (as indicated in accuBattery app on my phone).Quirk aside, this is a true fast charger for Samsung PPS devices like S20 and Note10, however it will only charge your phone only a fraction faster than the stock samsung 25w charger when batter life is below 60% or so. I used accuBattery to monitor the charge rate on the car charger and with the best cable I have, I managed to get a max of 5.9 amps on 4.3 volt charging rate (probably around 5.3 amp avg) when battery was being charged up from 5%, which is a respectable 25.4 watt, far cry from the claimed 45w however. The max i have ever seen on my 25w charger is 5.1 amps at 4.3 volt, which is slightly under 22 watt. So this charger charges around 10-15% faster. Having said this though, I want to say, even though I have never tested Samsung 45w Wall charger, everything I have read indicates it probably does not charge any faster than this charger. One caveat I want to mention is I do not have the best usb-c cable, which would be the thunderbolt3 cable, I only used the stock samsung note10 cable, which might limit the charging rate (type of cable matters ALOT when using PD chargers)In summary this is the fastest charger you can get for your note10 or s20 in your car. It's a bit pricey but well worth it since it can charge your phone easily to 70-80% in a matter of minutes