Hi
If you're talking about
----this one---- then yep, I reckon it's worth £30. It's what I use...it sits on the neatly on the visor, tidily out the way until I need to use it. Whenever me or my wife get in the car we just turn it on and press the button until it turns to the led colour that we've got paired to our individual phones. Then...beep, beep, beep...it's linked. When a call comes though I just flip the visor down, glance up, and press the "answer" button. Job's a good 'un.
Only thing I'd say is that you can't necessarily dial hands-free, only answer anything that's comes in. You might be able to set up a voice activated call, but that would depend on your phone, not on the hands-free.
I'd also mention that the unit is three years old or so. Technology moves fast these days, and mabe someone else has recomendations that are a bit more up to date! All I can say though is that it's served me well, is pretty intuative and provides a decent call quality. Don't know what your anticipated budget was, but at £30 it feels like a decent punt.
Cheers, anything else you want to know just ask!