Well I see huge differences between the Tyros series and the S series. I own both a Tyros 1 and a PSR S 900. While I like the 900 for a board in the studio or a backup, there's no way I could play this on a job. It's a toy in comparison to the Tyros series. I've A B'ed them many times and there's no comparison. I need the feel of a big keyboard. Even at only 61 keys, the Tyros has that. The 900's feel like toys to me. That's just my personal opinion, but it's the one that governs what I play. I will upgrade in the future to a T 3 or T 4.

Joe