I'm loving the DEX210 so far. The build sucked. That will be sorted out over time. The parts quality is very nice. I am running mid motor 4 gear on hard packed clay outside. The car handled great when the track was loose and really hooked up once traction came up. It jumps almost like a dream.
I did have hard landing on a huge jump and broke the rear shock tower. I got two spares in today. I hope that is not going to be an issue. I've heard of others (on the Oople forum) breaking the rear shock tower.