I was very tempted last night to go for a preowned Tyros4 but still felt that paying approx £2300 was a bit too much for my prospective usage at the minute.....although I do have a few regrets this morning.
I've been playing keyboards a LOOOONG time. I am NOT a Fanboy of any particular manufacturer. I will say the T4 is one of the most musically fulfilling keyboards I have ever owned; that includes the Audya, Pa2xpro, etc.. The style and Custom Voice offerings from Yamaha really are something special and gives the keyboard life from the humdrum.
I play wedding cocktail hours (along with ceremonies) with the Tyros 4 and people have actually started dancing to my Big Band numbers during the set!!! I've personally never seen that before. I'm even getting tips (which I normally refuse during cocktail hour). It really is a special keyboard. No, it does not have the Live groove feeling of the Audya, but it doesn't come with all the negative baggage the Audya comes with either.