PROS: first off I have to say I really love the design & the form factor.-The major highlight of this device for me is the rgb LEDs, I love em.-Very easy plug & play. Works right out of the box!-Delivers stunning image quality for capturing & streaming.-Wide compatibility with different resolutions!Cons: (1) Its designed exclusively for Thunderbolt ports, though the manufacturer also clearly stated this in the description, but as a power user, when you consider the long term use, adaptability, & versatility of this device,..... making this device to be compatible only with Thunderbolt port is a major let down.This capture device would have easily been the absolute best external capture card out there if only it supports connection via USB 3.2 additionally or if it's able to self record!!From my past experience, I've had situations where the major functional ports on my pc stopped working, effectively rendering the devices I had that were exclusively compatible with the port, useless.Hence why I always feel the need for new devices that I buy going forward to at least have extra compatibility for just in case.If for some reason my Thunderbolt port stops working, this capture card would become useless without the alternative of being able to use it on a USB port instead. While I totally understand the choice of Thunderbolt for this device given the high amount of bandwidth required for 4k60fps/hdr but I also feel having an option of usb3.2 won't be a bad idea altogether even if it means the capture card won't be able to capture full 4k60 on USB port.(2) Occasional noticeable frame stutter when watching the output video captured via obs.I already own 2 external capture cards from avermedia & this would be my 3rd one, and at this point it would seem avermedia still haven't been able to fix this issue.On experiencing this issue the first time with my GC551, I reached out to the support & their suggestions at the time was that maybe the USB port wasn't working well or change the cables or the drivers, but this doesn't seem to be the problem cos I did run the compatibility test tool at some point & the test came back 100% compatible & also i bought a 2nd avermedia external capture card GC513 which I used on a new pc, I never expected this problem to persist cos I thought it was the GC551 that had issues but it was the same problem with the GC513 too, however since GC513 is able to self record, it's output video from self recording played without the frame stuttering issues.Now buying this 3rd one GC555 which is top of the line, I used it on another relatively new pc, test CAPTURED @1080p/60 & 4K/60 via obs and sadly, the issues still the same.So it would seem avermedia cards might be having issues with obs.Worth mentioning that I don't use recentral because it doesn't have customizations for video overlays and whatnot as OBS does., so obs remains my application of choice when it comes to capturing & streaming.Overall, this is a decent capture card, nicely built with support for most resolutions.Only let down by narrow compatibility with connection ports and no on-board encoder. I really wish it had these features and it would have been the overall best external capture card to date!