Good deal on running it on 4S for now.
I did about the same but running only one 2S to first if nothing was binding. I usually do a complete teardown before the truck is ran, bit could not resist the temptation and wanted to test assembly and its handling out of the box.
I am very impressed, one of the few RC that without doing any wrenching at all, put some batteries, slap the body, minor steering trim its all it took. Handled very well. I wish the chassis was more stylish countersunk and more time dedicated to the final product of the tower finish, but thats a minor observation.
Most of the time I buy used RC, it was very difficult to find one in good condition at a good price. Most sellers want retail price and/or cut only a few bucks which is not worth it counting it is purchased as is.
Not sure how your setup is from the previous although it looks like he/she did not do much. On mine the diffs are too light, all three, in a few days open them up and add heavier weight.
Its an improvement over 1:10, I see it each class has its pros and cons, I got a Blackout Pro, not a real speed freak, have it dialed to handle pretty much everything and does look realistic like a SC truck, did a few things for it to move more like a truck and not too light that it bounces too much.