I found the old i series extremely poor in comparison to the new 800. I always loved the i series sounds and styles, but could never tolerate the terrible glitches.

I think each board may have its own character, because some of the competitive (current) brands on the market that I tried were absolutely terrible when it came to style glitches.

I'd say Yamaha is the smoothest, followed by Korg...the rest - way behind.