I've had my Wavi for a few weeks now, and i am very pleased with its functionality and ease of setup in general. it wirelessly streams through 3 inner walls at around a 60 degree angle, with 90% signal which is enough to stream 1080p with sound without any glitches.
The signal is delayed by about half a second compared to my computer, but quite frankly when i'm watching tv i don't care, cuz i'm not watching the computer at the same time :) but it wouldnt be suitable for high speed gaming i think.
The issues i have experienced with it is:
USB ports stopped working after about a week! quite annoying that i have to go to my computer to pause and stuff, its under warranty but i just cant be bothered to send it to germany where i bought it.
The power connector is kinda tricky, if you get it right it will work just fine if you dont touch it, but it can be a bit of a hassle at first when you dont understand why its not powering on even though the power adapter has been connected.