What is Reddit's opinion of Blackmagic Design DeckLink Mini Recorder 4K PCIe Capture Card?

From 3.5 billion Reddit comments

So something like this? Blackmagic Design DeckLink Mini Recorder 4K PCIe Capture Card https://www.amazon.com/dp/B01M126X2N/ref=cm_sw_r_em_apa_i_M1paGbBDV2VWZ

It's only $195!! How come so cheap? What's the catch?

How do I use it? So I'll need this thing will not drive my GUI? I'll need to have both my regular gpu and the Decklink connected to my monitor at the same time? The specs don't specify it's 10-bit though...

Ok, deep breath, here it goes... First, I added an HDMI port to my Dell Workstation so I could plug in my XBOX:Blackmagic Design DeckLink Mini Recorder 4K PCIe Capture Card After installing this hardware, I installed vMix. It's like DJ mixing equipment, but for video. Then, I took front and side screenshots of the in-game character creator, and pasted images of me over them. With vMix I set the L channel as my pictures and the R channel as the live video feed. Then I just used the fader to overlay the channels while I created my character. I watched a bunch of vMix tutorials to learn first, here's the first one I watched...https://youtu.be/bFPnPvWpzCM

Does everything that you said above about the DeckLink model also apply to their Intensity model as well? I kind of like the idea of having an HDMI pass-through, plus I don't know anything about "SDI Video" interfaces.

I also see a non-4K model of the DeckLink, does most of what you said about the 4K model (save for the 4K part) apply here too, or is the ~$50 saving not really worth it in the long run?