I love 'em - I find the colour rendering from CFLs/LEDs apalling[1] but the halogens are as good as / better than trad' tungstens in that respect, and they don't "strobe" rotating machinery, so they're now the standard fit in the Shed of Danger (mostly in bulkhead luminaires or Danglepoise lamps) other than the lathe light (12V 50W halogen after changing the bulb holder and transformer). They dim pretty well, although as another poster has mentioned it *does* reduce their lifespan. They seem a touch more rugged than trad' tungstens which regularly used to pop when I attended to the roofing felt (big hammer and clout nails). ASDA have them on special offer fairly regularly, not as cheap as the subsidised CFLs though!
Dave H,