Both of ours are hard wired, not wireless, and never had a problem with the streaming. Actually thats not true. After a windows update of some kind, possibly directx, all Unity based games failed to launch for about a week. Then back to normal.
The Steam controllers are not as awesome in my opinion, much preferred my Xbox controllers.
These things are awesome for when friends are over. Wish there was more games, but there are still a solid number of games that are great for the couch. Jackbox party packs, Tricky Towers, Tower Fall, Sonic All Stars Racing, Party Panic, Hell Divers, Overcooked, and the list goes on. Sooooo many good games and I got to keep them all in my Steam library without having to buy another console and rebuy games.