I've not used this wireless version, but I know how good JBL Control Ones are (when considering price and size) and these appear to be based on them. Usual internet price of around 150 squids, so this is a bargain. I've just ordered some for my zone 2 for my AV receiver but they'd be perfect as 5.1/7.1 rears if your AVR has line level o/ps for these channels.
Free delivery too.
Merry New year.