The product is sturdy, well insulated and well-made. If I have a problem it is one of my own making. My keyboard (Yamaha 155) is already heavy, and the bag increases the weight. If I were a few years younger this would not be a problem, but having just returned from a gig I am feeling a little feeble at the moment. But don't let that put off any other (younger) person. It is an excellent product.
Love this case. Use it for a stage piano that's too heavy for lifting, where the wheels come in handy. Material, zippers and wheels feel durable. Only thing I would have wanted is a more sturdy construction in the lower part since the wheels can "bend over" slightly due to only being attached to the soft fabric. Doesn't impact useability, so I regard it as "nice to have".