Been looking a little at this after having what I believe is a fault with mine. The oxford grips generally come very well recommended and certainly much cheaper than the yamaha ones. Certianly at the start when I had them they got pretty hot and they turn off with the engine to prevent getting a flat battery. Unfortunaly mine are not getting hot properly anymore (not ideal with sub-zero temperatures today) so I will be going back to the dealer to get it rectified (I got them fitted by the dealer as new when I got the bike and they aparently come with a 2 year guarantee). Just got to last until the 6th Jan when the dealer re-opens after their Christmas break. They're only justs getting warm even on bare hands but it was just enough to keep me going this morning.

Overall I'd recommend them