Took about 30 Minutes to get it out of the box and set up to fit the our piano. No tools required.

This trolley is adjustable (length of the digital piano and length of its legs), sturdy, and well made. It rolls effortlessly even when carrying a heavy piano because it has four heavy duty caster wheels on each leg which are able to roll independently as you change direction. The wheels lock once the piano is in place. There is a horizontal beam at the bottom in the back to support the pedal mechanism and an adapter is provided if needed. Only thing that could make it even better would be simple clamps over the ends of the digital piano legs to prevent it from lifting up when moved should someone try to pick it up to go over a seam between flooring changes.

Fits our electric Yamaha very well. Provides good support and is not wobbly at all. Glides nicely across the floor. Very low profile.

The only negative is that only 2 casters lock, so the piano skates around a little as you play it.

This is exactly what I needed in my room. I can easily convert my music room by moving my digital piano thanks to this trolly. I teach elementary music, a high school piano class, and a middle school chorus. This product is perfect! We have to move the piano into the gym for graduation at the end of the year and this made things so much easier.

This K&M keyboard trolley is well-made overall but fairly lightweight in construction. I don't see a weight limit for it, but I wouldn't put anything on over 80# or so. It's a bit fiddly to put together and get adjusted to the keyboard (the enclosed "wrench" is all but useless), but it works.

However, my big complaint is that the wheels are pretty small -- this lifts the whole keyboard about an inch (which is good for playing). BUT... if rolling up an incline, the connecting bar in the back "high-sides" in the middle at crest of the incline. It even hangs up when going from tile to a carpeted floor. There is very minimal clearance under that bar when going over a threshold -- it rubs. This is with a full-sized keyboard, so it's stretched to 52" -- a long span between the ends. I'm trying to figure out if replacing the castors with taller ones would help, but then the swiveling wheels won't clear the brackets. I'm keeping it, but I'm disappointed that it doesn't work better for the cost of it.

This will work fine if you keep it on one level (say, a classroom), but any type of incline or threshold will be problematic.

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We purchased the K7M digital Piano Trolley in place of the Yamaha trolley due to cost. So far, it was an easy assemble, it is adjustable so we could make it fit our Clavinova perfectly.