Bunkermagnet
Journeyman Pro
Since people have their under warranty cars chipped, I doubt whether losing the warranty would bother those that want to cheat the system, as well as the law.Yeah you can get them de-restricted, it's expensive though and potentially mucks up the warranty.
Ideally I'd love maybe another couple of mph on mine as my comfortable cruising speed is right on the limit at around 17mph, it's not worth £140 and maybe a very expensive repair job though imo.
I would also imagine that as these becaome more popular and common, the nerdy types will soon have a more cheaper way of cheating the bikes.