I've tried VPC1 yesterday (finally) in local shop (although with no sounds, as I just went there to buy some cables). If I was about to buy really good piano controller, that would be my choice. SL88 GT Mk2 looks nice on paper, but I don't trust the brand. Reading about wood veneers coming of keys and some velocities inconsistencies is not encouraging. Regarding VPC1, I felt shorter pivot (compared to PHA50 I use at home), but it wasn't deal breaker. Among all I played, that was still my favorite action there (and I tried CLP775, Casio GP510, PX-S7000 and old PX-5S, Kawais MP7SE, ES120). Also, funny thing - I liked old PX-5S action much more over their new one in S7000.
The worst think with Kawai, I think, is that you guys in US pay almost twice as much as we Europeans.