Feature:
It's the design. Great design. Very compact and portable when folded up. Easy to fold and unfold, and secure in either position. Great for moving heavy things like air-conditioners or 6-space racks up and down stairs (remember to strap the things on with a ratchet strap!). It has 1cm-wide holes through which you can thread rope to make it pullable like a wagon (Do this!). With the unit totally unfolded and expanded, you can carry 6 to 8 liquor boxes on it. As a platform cart, it really is better and easier to use than some commercial carts. Easy to maneuver.

Quality:
It's made of strong square tube and rod steel. The wheels are plastic (and the bearings are just plastic on steel (sleeve bearings), but I've had no trouble with them. The two knobs used to tighten the cart after sliding it to be longer or shorter are plastic, molded onto hex-nuts. These knobs are cheap. After a while of tightening and loosening, they have cracked off. You'd think you'd need a wrench to tighten these nuts (without the knobs), but you really don't. Finger-tight (wearing gloves) is almost good enough. That's why I give it a 8.

Overall:
I needed a cart for a variety of jobs, all non-music related. This summer my R2 Micro was expanded and used to haul gardening supplies/equipment as I worked in the yard, including some very large pots. Recently I used it to haul suitcases and a cooler into the hotel where we were staying and putting on a presentation. From the hotel room, it was used to haul the presentation materials (large framed photos/posters, easels and boxes) to the other side of the convention center (a considerable distance). Frankly, I don't know how we would have done it without the R2. In the future, it may be used to haul a dog, a dog crate, a grooming table and grooming supplies to the show site. I especially like how compact it is for loading in my trunk ... and it hangs nicely out of the way on my garage wall. Basically, it is the best $100 I've spent in quite a while!

Quality:
It rolled down the stairs at the apartment where I live . It made alot of noise but you'd never know it took a fall .

Overall:
I can carry my Yamaha Birch kit on it in bags and it fits perfect !!! When you fold it up you can hide it out of site . Its not too heavy . And its built like a tank !!