I'm considering the MK802+ due to the 39.99 price, etc. I have a Motorola Atrix Lapdock and it is supposed to work with it. According to what I've read here and on XDA, it also apparently plays Netflix fine and can be upgraded to Jelly Bean. Though I think you have to use an older Netflix app for Netflix.
That said, I have read mixed reviews too. So I am still waiting despite the more recent reports that sound better. Also, I would prefer one with a dual or quad-core processor. However, depending on the price that isn't a big deal.
there was a big thread on the mk808... and in that thread they also talk about the ug007 so might seach through it before buying either.... see which one you think will fit your needs best