Actually, there is one Korg unit with an excellent piano on board. It's the TR Rack module. It has a different piano than the Trinity. It's the same samples as the main sound in Korg's SGproX. You need to do some tweaking on the envelope and FX, but I have both, and it is the same sound. I've never liked any of Roland's pianos. They all have a certain 'boxy' sound in the mid-range that reminds me of the old RD and MKS pianos. Not very realistic in the upper range, either. Even the acclaimed Session board grand is tinny in the upper register. And the A90 piano is awful.