I bought this guy because I wanted an something a bit bigger than my Bosh and it was on sale and pretty cheap.
http://www.sears.com/shc/s/p_10153_12605_00917338000P?prdNo=10&blockNo=10&blockType=G10 I freakin' love this guy. I use it for everything now! Zipping stuff apart in the shop, Home projects.... Kicks *** driving screws. My Neighbor was building shelves in his garage... Loaned it to him to make his life easier. He loved it so much I had to basically steal it back! Worth every penny I paid for it.
Then Since I already had the Battery and Chargers when the C3's went on sale again I added the 1/2" for something Like $80
http://www.sears.com/shc/s/p_10153_12605_00917090000P?prdNo=5&blockNo=5&blockType=G5
It easily zips the Lugs off my truck for me which is basically what I wanted it to do. Rear Axles on Bikes and Pull wheels of cars. Anything much bigger I expect to pull out the Air Impact. Regardless, for the price, It does really good and I'm happy with it for sure.
Then, my 18v DeWalt died (after many years of some real abuse!) So I added this guy for under $50.... Definitely not as nice as my old Dewalt, but I used it for a job the other day that made me $500.... So I'm thinking it Paid for itself.
So in short, I don't think the Cman Cordless are necessarily the best.. But for somewhere around $300 I have 3 tools, 2 batteries and a Charger. I've been more than happy with them. I can't testify how they'll hold up to everyday use for a year since I've only owned them for a few months, but so far so good!