I have a cheap Logik IR100 - Works OK though.
Only requires a Wifi connection and mains power to run. PC not required.
Some sets are uglier than others..! Some buffering and cut outs happen, just like listening through a pc or mac; streamed content is not completely reliable.
My set is linked through Reciva's Web site see
https://www.reciva.com/
I've listened to live sport on Radio Five Live before, so not had any issues as mentioned earlier. You can also listen to podcasts etc; say Radio 4's Any Questions from last Saturday for instance.