300 ft/lb is not a lot these days... in what context? By comparison with other tools on the market? Or are fasteners suddenly getting torqued down more than they used to?
If the OP is using it for working on normal cars changing tires and the like, I'd say 300 ft/lb is probably fine. If he's working in a shop as a diesel tech five days a week then maybe not. FWIW I use a C3 with the larger lithium XCP battery at home and it handles my lugs just fine. I've got Milwaukee Fuel at the shop though.
Compared to other tools on the market.
Originally I faced the same dilemma as OP, I was heavily vested into the Makita LXT line, so it was a no brainer to buy the impact tool only, also rated similarly at 325 ft lbs. The thing was a major disappointment. It didn't have the power to break loose lug nuts on my GMC 3500 Dually. They only call for 148 ft lbs iirc.
So I picked up a Snap-on CT6850 and it would zip them on and off no problems. All was good. Recently I decided to switch to Milwaukee, as I've been using them at work for the better part of a year, and they hold up well. I switched mainly to consolidate batteries, as I had Makita, Snap-on, and Dewalt.
Buy once, Cry once. I stand by my original recommendation. Fuel Kit with 2 batteries for $ 329.99 was too hard to pass up. Buy into the best system you can now and it'll be cheaper than upgrading to something else a few times over the next few years because what you have isn't cutting it.