I wouldn't, but am pretty confident their plastics are better. Unfortunately that's the only place the Sledge wins. We have all the usual suspects here between my brother and I. The Sledge underperforms, diffs suck, hinge pins and shock caps break. Driveshafts too. It's weird, cuz the 2, 3, 4 and 8s are solid, but the Sledge just doesn't impress. E Revo either. I imagine the Slash 6s is decent, but seems like Traxxas does better with the plastic than metal based rc's.
K6 vs Sledge, I feel the K6 is the easy choice. I complain of slop, but it is a basher, so most don't care about the slop. Since we run a track, we're more critical.
I should add that after spending $800 on the Sledge, and another $3-400 in upgrades, my bro thinks his Sledge is a beast. I's say it's a tank, and runs like one too, slow and steady. LOL.