Another

for the HW v2.1 here. I used mine in boosted stock and 'blinky' stock in 12th and GT10 racing, and it is very good. The latest software that sits on your PC is fine, and the programming box makes it easy to make changes quickly in the pit without the radio switched on.
CPD Racing stock the item and provide excellent back-up for your queries. Check them out if you are new back as their support (Giant Shark are upfront on this; they don't have car racers on their staff) could be worth a lot more than the few £££s more you'll pay. HTH