If you're looking for a road case for your Montage, consider a custom-built case from Thomann - an online music company based in Germany. In addition to standard cases and gig bags, they also build custom cases to your specifications.

The Montage is a heavy synth. Add a road case and it's even heaver. Because of this, I went beyond just a version with wheels and ordered something special, with a feature that is not on their standard list of options. I had them install a third handle on the bottom, about a foot from the end and rotated 90º. This turned out to be a revelation for me. (See attachments.)

When you are dragging a wheeled case by a handle on the end, half of the weight of the is hanging from your wrist, like a heavy suitcase. By mounting this third handle, the angle is higher and with the weight now resting on your arm it feels like it weighs almost nothing. In addition, you can push the case by holding the handle and treating the case like a hand truck.

I've owned many road cases over the years. I wish I'd thought of this earlier. If you're looking for a case for your Montage, see if the case builder can add a handle in this way. If you go with Thomann, you'll get a great price. Their flat fee for shipping just about everything is only $35, but the length of this case (with storage compartment) exceeded their specs, which meant USP shipping. Still worth it.