I inherited a set of C3 tools and they are great. Only drawback seems to be the crazy pants ebay prices for additional tools. I'm not a collector, just someone who is learning and expanding project wise and not looking to invest in another platform.
I'd be interested in the inflator, dust...
Recently picked up one of those 5Ah c3 batteries and I'm a little dissapointed. It dies before my much older, lower capacity batteries.
It's fine and craftsman isn't making new ones, so it's at least nice there is something available, but my experience so far with other non-oem Li ion battery...