I've been all about the m12 tools for the past 4 years, the compact batteries are what I liked the most. They allow you fit in tight spaces. Recently picked up the surge with the "compact" m18 batteries and it is my go to impact, but the only complaint is the how large the m18 batteries are. I'd love an m12 verision. But I think we need someone to make an actual compact battery for the m18 line. Something like the Makita 12v battery. It would save almost an inch which would be very helpful. I know using longer bits help, but I think shorter is always better.