What sucks though is that purchases there only appear there. (They won't appear in your Steam library - even though they show you your Steam library content in Viveport)
Also, if you create an account, be careful to access it the same way each and every time. I created one using an email address/password. Bought a title. The next day I went back in, entered my email address but decided to hit the log-in via steam button. Worked great. Bought another title. But it created an entirely new account - associated with the exact same email address and name without even informing me it was doing so. So it looks like I have two identical Viveport accounts, each with the exact same user name and the exact same email address, but each with its own purchased game library and I now have to jump back and forth between the two... Sucks. And the VivePort site looks like it has no way of contacting tech support. Oh well, only spent a total of $2 on a couple titles. No great loss.
I just grabbed the $1 stuff that is also on Steam (but full price there). Wish it came with Steam keys, but it doesn't. Anything else that's not on sale and worth getting can be had on Steam. Not going to risk buying any of the titles coming from their Chinese marketplace (to include the free stuff) due to: A) Unknown quality - many of them look terrible, just watch the video previews, B) Menus/text being in something I can't read or potentially poorly translated, C) Potential malware carriers. If you run across anything praise worthy, feel free to post about it. To me though, Viveport is pretty weak sauce - I prefer Steam.