[Update] Looks like they got too much attention on the close copied design. This product is gone....
Proaim is the Video camera equipment company based out of India. They've got a ton of shoulder supports, shoulder rigs, matte boxes, follow focus systems, and more. This time around it looks like they're stepping on some toes with their latest product, a Carbon Railed Roller Track Dolly, which is an obvious design knock-off from the big guys in Black and Yellow. In one direction, the rails mount to tripods, and on the flip side, it can be used on the ground. Claims to be an all Aluminum design with rubber coated steel roller bearings and lightweight Carbon rods. Comes with it's own foam cut travel case and weighs under 5lbs. Quality and Customer service? I'm sure you know how dealing with over seas companies go, but you're probably also familiar with why prices would be so darn cheap.
Proaim Carbon Roller Camera Track Dolly
I've seen the real deal up close and wheeled track dollies are a beautiful thing. Especially if you're dealing with harsh dirty environments like sand that can get caught up in other types of linear track systems. Wheeled dollies can also be taken 'off track' for some short rolling camera movements. If you're looking for the original high quality stuff, you can check out the Pegasus Carbon package via the Cinevate website here: http://www.cinevate.com/catalog/product_info.php?products_id=108