I've drove this and the ECO. To me the 811-Be is much more refined. Like the one guy stated it drives a lot like a Losi, but more stable and more steering. The ECO actually had more over all steering, but it pushed a bit into the corner then steered hard. It wasn't as consistent into the corner as the Serpent. The serpent also jumps more level and lands better. I know some of these observations could be adjusted with setup obviously, but both cars had what was considered the current "good" setup on them.

I got the chance to drive both cars, because I was trying to decide which eBuggy to get, I chose the Serpent.