I upgraded from the T2 to the T4 after trying the Pa2xpro and the Audya 4 after swearing I would never again buy another Yamaha because of the lack of drums and the ability to customize. I took a risk by buying the T4 after hearing all those great voices and styles; I tried to look past all the shoo-be-do-wah stuff and look at the meat and potatoes.
Boy, am I glad I did. After owning the T4 for a few months, I am blown away by it's sonic ability, sheer volume of top notch voices, and the great styles. Plus I didn't have to give up all those Yamaha styles I have been hoarding over the years. The FLASH ram has worked out really well for me as I do a lot of custom sampling and load times are ZERO when you power up this puppy. I love the more diverse and capable vocal harmonizer. It's just a great overall board and leaps and bounds way beyond the T2. Do yourself a favor and go and play one to experience the sound quality first hand. The string and Sax voices alone will knock your socks off.
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Al
Pa4x - LD Systems Maui 28 - Mackie Thumps