Seems to be a 20% cheaper version of the Wimberley Sidekick. I'd check out Wimberley's page on full gimbal vs. side mount to help your decision.
Personally, I think the full gimbal is the better choice (and I like the RRS version for the added flexibility of conversion to nodal pano head, although an additional $140 clamp is needed).
The sidekick seems like a better model. I like the rrs gimbal but isn't it like $800? Lol I'm looking for something that can maybe clamp on or something so I don't have to change heads if the tripod which isn't a big deal but of course a full gimbal would be much more sturdy