My main observation is too obvious but significant. It's that Tyros now has a 76 key version which I had been waiting for, for close to 4 years. I would have been happy with a Tyros 4 76 if it were available at the time that I considered a Tyros. But, now that the new T5 76 has even more features, it's all good, and a big bonus to me. Based on my style of playing, the 76 is the tipping point that got me to order it at this time. The extra sonic features beyond that are fully appreciated as well.