I've found nothing wrong so far with EBC - fitted EBC sintered (enduro type - red in colour back plate ) - EBC shop on ebay.
Originals didn't last long - use a lot of back brake - and in dirty conditions, but if you are looking at general use I'm sure the standard ones won't let you down.

http://cgi.ebay.co.uk/EBC-FA244-Fron...item439cefde23

http://cgi.ebay.co.uk/EBC-FA213-Rear...item335e8d6a89

This is the type I fitted to my ten:

http://cgi.ebay.co.uk/EBC-FA208TT-Re...item335efc2842

OR

http://cgi.ebay.co.uk/YAMAHA-XT660-X...item19c4276bac

http://cgi.ebay.co.uk/YAMAHA-XT-660-...item3cb86fae9c

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