Hi. Guess I'm the new guy. Glad to be here!
For weeks I've been cruising the net looking for the best deals on the most powerful 1/2"
cordless impacts, & other tools as well, such as 1/2" [edit] reversible drill, 3/8" impact, & 1/4" female impact driver. It seems Matco has the most powerful 1/2" impact, but with the numerous torque ratings out there (ultimate, breakaway, max, normal working, stall torque, etc, you really don't know what can do what.
I finally settled on the Milwaukee line, except for the 1/2 [edit] drill, where I went With Ingersoll Rand. (A few years ago I bought an IR 3/8 cordless ratchet & the charger that came with it still charges any lith-ion IR battery.)
I think I made the right decision, esp. with the 2663 Mil 1/2 impact. Everything's a compromise, & although the Matco MCL18IWVS 1/2 impact may be a little stronger, its significantly more bulky. What good is the most powerful tool if it can't get on the fastener in question? Moreover, I also got the 2664--Milwaukee's 3/4 drive impact rated at 525 (!) "normal" torque rating. The 2663 (1/2 impact) kit with 2 lith ion batteries, a charger, & the 2664 3/4 impact bare tool came to $100 less than what I would have paid for the Matco 1/2 drive kit, plus the Matco salesman said it's only a 1 year warranty for batteries & tools. (Milwauke--5 year, albeit a limited warr) Plus, if you're handy enough to take these things apart, Milwaukee publishes parts lists/diagrams.
I bought the Milwaukke stuff unbeknownst to my local Snap-On dealer, who lent me his personal Snap-On CT6850 1/2 impact to try out for a week. Power-wise it seems to be a draw between the 6850 & the Mil 2663. Just gut feeling here.
I wish I had a 3/4" drive torque wrench so I could torque something to like 600 ft-lbs and REALLY see which gun has the most cohones!
Sorry for long post. KS
P.S: The Milwaukee 3/4" gun is actually shorter than the S-O 1/2 6850 & the Matco 1/2 gun.