i've had the Dewalt 18V XRP line of tools for about 3 yrs used frequently on home repairs/renovations (a lot of renovations the last 2 years, practically a 2nd job), and car repairs (i use the impact driver as a socket driving tool with adapter and their impact wrench takes lugs off in under 2 seconds). so, i'm happy with these tools, but i only got them because i was able to get really good deal on them not knowing their quality. i have to say i'm impressed with them so far, but i also take care of them. i clean them after use, i'll blow out dust, etc. the newer XRP stuff can use both their NiCd and Li-Ion batteries, i have 6 NiCd and 3 Li-Ion and love them both... the heavier NiCd is actually a better "anchor" for the flashlight so it doesn't tip over as easily.
that said, i secretly want a set of bosch 18v tools... but I'll only do that if my Dewalt set becomes really really obsolete and break down on me.