Very Debatable, Wireless anything can be very finicky depending on surroundings. Obviously it needs a clear path for the best possible transmission and going for cheaper kits can potentially be even more problematic. I personally would say no those are not worth it, but then again I'm a gamer and I've never tried it either. 100% guarantee you will be disappointing if you are expecting any sort of decent Latency/response time when it comes to gaming or playback.
On the other hand, if it's just for watching movies and that sort of thing then, well it might be worth a try, just get something that has decent reviews and potential to get a refund if it's a shotty piece of equipment.
You might also just google "hdmi wireless worth?" just to...