This might be old news for Tyros owners since the board has been out for a while already but i thought i'd add some of my own comments.
I'll try to compare it side by side with the VA7 since this is the other keyboard that I currently own.
Bootup: definitely fast, Tyros boots almost instantly as oppposed to the VA7. Va7 takes forever to come up, especially when you have a zip disk inserted.
Zip disk vs hard drive ? doesn't matter to me.
Ease of use: tons of buttons on the Tyros, definitely beats the touchscreen on the Roland. The navigation on the Tyros is awesome, very easy to use, very convenient and provides a very fast access. Big hat to Yamaha for the interface, impressive color lcd. I even hooked it up to a separate display and it still looked good on my Sony.
After all this time owning the VA7, I'm still uncomfortable sometimes with the touchscreen.
Sounds: still leaning towards Roland for the sound. Just my opinion though, Roland sounds more 'realistic'. I still like the VA7 grand piano, synth brass, v acoustic guitar, sax. I think VA7 has a lot more sounds than the Tyros (around 3,649 something for Roland vs 1149 Presets for the Tyros). Megavoices do sound fantastic and impressive though.
Styles: I love the ballads/pop on the Tyros. Dances styles are a lot of fun on the yamaha as well but for everything else, VA7. I have to explore more in this area though since i've only had the Tyros for a few days.
Key feel: Roland.
Overall, I'm having a lot of fun with the Tyros. This is a great board, with a very modern and stylish look. The weight makes it very attractive to take it anywhere. However, I wish the Tyros had a D-beam controller since this is a feature i use quite often. VA7 is quite an old board now and it might not be a fair comparison with the Tyros but it still sounds very good and I'm not ready to give that one up just yet
Claude