I had a pretty bad experience with Ketron, but it was over 10 years ago.

I would prefer to not have to ship my keyboard for repair. I had to do this with my Solton X1, and twice they returned me broken replacement boards. Third time was a charm, but they made me accept a board that had a gash on the cover.

I've been happy with Yamaha. When I purchased two PSR-S900's and both were defective, they let me return both even though I put a scratch on one.

My Yamaha repair facility is less than a mile from my home! I rarely need them, but it's good to know that they're there.

Beakybird