i have a redcat lightning VX. problems i ran into were alot of loose screws. make sure you check EVERY screw and put locktite on the engine screws and engine mount. other than having the clutch spring break twice on me causing a mysterious tuning issue i thought i had. it has been a great on road and i do agree that it is VERY fast and shifts like a dream. i bought mine for $150 bucks and it came with a redcat tool set with pretty much everything i needed to tune and repair it. i dont know about yours but mine runs a little on the hot side getting up to about tops 265*-270* in its richest condition that i could keep it running at. electronics were good never had a problem with them and thats pretty much it. i think its a great deal to get one for 50$ or 60$ even $100 for that matter.
the only thing had I've heard about the VX engines are that they dont last extreamly long but can be replaced by better engines. VX series engines are in exceed nitros too. but other than that i would give them a thumbs up for cheapness and mild reliability. definetly worth the money.
send me a PM if you need anymore questions answered