I have only the smaller refurbed 20V Dewalt drill. Good power and the light is handy for working in dark spots. There is a funny smell while functioning which is probably grease burning off. I'm reminded every time I use it but there seems to be no loss in performance. As I said, its a refurbed unit so my expectations are lower.
The drill (DCD771) is a good, tough unit, I've used one for over a year, and it delivers good service, even in tougher jobs. The impact driver (DCF885) is, well a lightweight. Yes, it can get into tight spaces, and if you're driving # 8 or smaller screws into soft wood, it drives/extricates them very quickly, but when mine encountered a somewhat denser area of fir wood it tried for a second or two then stopped dead. A couple of beats later it was operational again. I found it a bit of a disappointment. Nice little work bag. At around $160.00 it's an o.k. deal - but no more.