I just got the dewalt mid range impact with 2 5ah batteries for $136
Its abit of an odd ball vs the big heavy dcf899
I really like its weight though vs the heavy one.
Short comparison
dcf899 high 700 medium 300*(300 something from memory) low is under 70ft/lb (real life)
dcf894 high 350? low 150 middle position is used for smart setting.
I do sort of miss the lower setting on the mid range impact because at 150 it can overtorque lug nuts etc if you arent careful.
The "big" impact on the low setting is about perfect then finish off with torque wrench.
The mid range is much nicer for changing blades on tractors etc. I actually twisted my bad wrist trying to center a blade while overextended.. that 10lb impact has a decent amount of leverage on you fully extended out laying on the ground. The dcf894 is more compact and much lighter. It wouldnt take off a very over torqued 1.5" nut on a trailer hitch though.. the dcf899 had it off in about 2seconds.
I pretty much dont use the dcf899 anymore.. but its nice to have occasionally. I've considered selling it... but when you need one.. its just so handy.
I was considering a different brand but getting the 2 extra 5ah batteries made sense esp for my dewalt brushless grinder.. the impacts themselves can go pretty much forever on 1 5ah battery.. as long as you arent hammering on some stuck semi lugs etc.
The grinder blows through one in 15min of hard/heavy use.
($167 after tax and 18% off on the GC =~~138)