I have always been happy with the stock Metzlers, on my 3rd set at 47,000 K's.
I'm a bit confused as most here are stating the original stockers were Metzelers. I have a 2003 T100 & it came with the BT45's I replaced them at 8,500 miles. The rear was worn fairly smooth. The front had some miles left on it but I decided to replace the set. I've been happy with their performance & cost was not outrageous.