Drilling a round of holes in a 2' thick stone wall, for a 5" flue and the Bosch went phut with a flash, a puff of smoke, an acrid smell and a "Bastard!", as it happened near my head. It lasted amazingly well; eight years of heavy use drilling and chiselling, with only a set of brushes needed two years ago. The model was a PBH 2200RE, green body, but behaved like a blue'un.
Ho-hum, I had to dig out the standby; an old SDS 110V AEG badged as Atlas Copco, but which doesn't have rotary stop. Tough old thing, though; it carried on drilling the holes. Annoyingly, my 650mm 12mm SDS bit got well and truly stuck in an 'ole and I called it quits for the day, leaving it sticking out. Sod it, it can wait until I chisel the plug out of the middle.
On the way home I dropped into my local hardware/farm store and picked up a nice shiny Makita HR2470 SDS rotary stop drill with some bits and chisel (only normal, these days) thrown in the case.
I love new power tools :)