Aww man I'm keen to try this one out again.
I bought the MK2 but ultimately sent it back. It did indeed sound massive but it messed with various stereo patches on my Fantom XR. Mainly reverbs that could sound like they were in giant hallways. It would've meant re-programming them and any other potential new stuff that I played through it could sound too much.
However, some time after I sent it back it I bought Pianoteq modelling VST which has user positional microphones for the sound and it led me to think if you actually adjusted the sound to the speaker you could really start to get closer to the dispersion a real piano has, anyone who has the MK3 and Pianoteq I'd be very interested to hear some experimentation!
Currently I'm not using imitative sounds anymore and I'm again interested in the centre point idea. There seems to be a lot of improvements in this new one. My biggest quibble with the MK2 was that ultimately it sounded boxy. I spent some time running my main two piano sounds through an Aphex eq to tweak out the boxiness but when it came to raising the volume it would still show itself.
However, I reckon with a speaker like this one needs to readjust how they think about the sounds they use. I get it that some sounds require that punchy mono spot but then again, how lovely it is to bathe in swirling harmonics when you've got a more wide open patch.
Actually, I'm fairly keen to get a TC Electronic Corona chorus which is meant to have a stellar if not improved Dimension C effect & a tri-chorus. Putting some patches through that first before hitting the MK3 could lead to dangerous stereo vortex effect that might just swallow up the rest of your band members