Really the biggest problem with the sledge is the pot metal gears, garbage ESC and the weak chassis at the motor mount. A different style motor mount makes it so when the chassis bends at the motor mount, it doesn't affect the mesh. Machined gears fix the gear issues. MM2/Max8 fixes the ESC problem. For the price, those aforementioned things should be standard, which is my gripe with the sledge and it should've been better at the price they were asking. Plastics are stupid durable and I'm yet to break a plastic component aside from a wing I ground down to nothing from wheelies, which makes me glad I stuck it out. Any traxxas 6s rig, I go ahead and add $150 to the total price because I know the vxl-6s wont last a week of consistent running before it blinks the red lights of death.
The arrma stuff I've never been super impressed with either. Some of the flimsiest and weakest cars in our little group were/are Arrma 6s rigs and the Granite Grom that floated around for a while was a joke. They never make it to the end of the day, much less 2 battery packs doing the same thing every other car takes in stride unless they have hundreds of dollars worth of m2c parts all over them, then they're durable... but, at that point is it really Arrma tough or m2c tough? People like them though and just like the sledge, my experiences aren't everyone else's. Arrma updates them regularly too. They're still solid cars in their own regards. Just not my cup of tea! lol I do like the 1/10 Arrma's and their 4s stuff. I just think the 6s line is way overhyped and not nearly as strong as people make it out to be unless you spend the money to make them durable. I feel they have a similar money trap to the sledge.
My Team Corally Asuga was awesome and that's exactly how an 1/8 rig should come out of the box IMO. Other manufacturers need to take notes! Some issues are expected, but I shouldn't have to replace a majority of the car to make it handle the abuse 1/8 buggies from other manufacturers have been able to take for the last 15 years.