UPDATE:
Well, I went and ordered an MK802 II. It was only $38 on amazon (the authentic version too.)
Setup:
First thing after turning on, I flashed a new rom (Unlock MK802 II). After that, my MK802 II was fast, stable and usable. Flashing was easy (download rom, use Phoenixcard to burn to SD, put SD in device, done.)
Playback test:
Inception 1080p bluray and Ace Attorney DVDR played fine. However, some of my anime files (10-bit) stuttered or freezed in MXPLAYER. Oddly, some worked fine (Horriblesubs Gintama 249).
Video streaming:
Netflix loaded a bit slow, but the video played fine when fully loaded. YouTube was fine too.
Torrenting:
This is what made me really happy. I got 1MB/s speeds, which is as fast as my computer/internet can go.
Overall:
I'm very happy with my purchase. I'll be using this instead of my computer to watch/DL movies.