I also like the Makita but I'm still with the 9.6 V model. I've only
broken one driving a series of 6" lag screws with it. They've survived
any number of nasty falls. I like the light weight of these models and
with my recently acquired right angle driver (30% discount) I've got 4
now. I've also refurbished many junked batteries and now have 12
working.
The newer trend will probably be LiPolys, very light and powerful.