I have to weigh in on this one, I broke down last year and bought the dewalt combo drill,driver, sawzaw and light 18v It was a price issue. I am happy with it. I built my whole deck with it. The driver is the (POOP!) LOL didn't want to get in trouble. The key is, I know on dewalt the charger never shuts off. So after the light quits flashing you need to remove batteries then. Don't leave on charger. If you have trouble like me remembering, use a timer. The batteries loose a lot of life if you just leave on the charger all the time. Now as far as the new Ion batteries I don't know anything on them.
I bought the same thingonly thing that still works is the driver and batteries, i actually leave mine on the charger all the time, I don't know if my charger is a smart charger but it has the battery maintenance mode which I use almost every time.. Sawzall you can hold the blade and pull the trigger and keep if from moving back and forth, the drill has absolutely no clutch left in it you can hold it with 2 fingers on the highest setting and it will just click, light only works when your slamming it off your hand because it won't stay on..