I've been doing a bunch of research on the PlayStation TV myself recently. The price is really great (a bit more than I can afford right now, especially considering I'm saving for a PS4, but still), so that's always a plus. From research I've done though, it seems the PS TV is still in pretty early stages, and at least from the last I heard (which was around the end of May) you can download apps like Netflix and YouTube but you can't actually run them yet. Some other apps though, like Crunchyroll, are working.
I've also seen that a lot of the compatible games for the PS TV (including PS Vita games in some cases) were removed, but that shouldn't really impact your opinion unless you really wanted to be able to play some of the incompatible games.
Overall I haven't heard any specifically negative reviews; everything I've seen has either been positive or neutral. Good luck with it if you decide to give it a try!