I was tempted to try the S88 MK3 because I was super happy with my (non-heavy weighted key) S61 MK1. Over YouTube, people keep mentioning how great this keyboard is, and actually it is a very good one. However, the action, is nowhere near a good stage piano with midi out (think something like Nord Piano 6 or the even better Yamaha CP88). Can you play piano on this keyboard? Absolutely. Can you get the piano-like feel like being advertised, I am not 100% sure. That being said, it has great features. The integration with Native Access, Komplete, Kontakt as well as other software such as the Arturia universe is really great.
Overall, it is a good keyboard and honestly one of the top in the market (maybe with some Studio Logic etc option). But the keybed is nowhere near where advertised without this meaning it is a bad one whatsoever.