I've had that set for about 7 years, now. And I've added a recip saw, circular saw, and recently a 1/2" impact (350-ish lb-ft rating, bigger than teh more common one). It has been a much better set than the Ridgid it replaced (drill is way out of round, has been from day 1 - Hitachi is better), and teh batteries haven't started dying, though the Ridgids Ni-Cd ones did at this age. I am very happy with it. Battery life has not been an issue for me, but I have a pair of smaller batteries (2.0 AHr?), and now a 4 that I use for the saws. Take them to the track for the weekend, and have never run even one of the smaller ones down.
Overall, I'm very happy. Great tools for a ********* DIY-er.