I bought this keyboard because I moved to another country, and bringing my old one was not an option. I've been thinking about the S88 for a while, so I made my mind, and got it. Not an easy decision, it's quite expensive for my budget. But I took the risk.
It goes beyond my expectations. I thought I'd need some time to get used to polyphonic aftertouch, but it's amazingly easy to get used to it (and it has control over the sensitivity). It's really expressive. Again, it's really expressive. A lot. Probably the best keyboard I've ever played. And with the last firmware, you got a lot of improvements from the original version.
You can split up to 16 parts (if I'm not wrong, but I've tested to a lot of parts). It's more customizable than I thought, but easy to use from the factory template. And the feeling playing it it's amazing.
The best keyboard (and controller) I've ever played. And I'm still not using it to its maximum capacities.
Really happy with the purchase!
A bit (well, more than "a bit") angry about the delivery (left under the heavy rain in the street). But I'm really happy with the keyboard. I hope that in next firmwares they give it tighter control over more DAW's, such as Reaper. And the option to easily disconnect from the DAW, if you want to use it in other ways.
In conclusion, it's the best keyboard I've ever played. And I'm really happy with it.