I just played around for the last half an hour with the new firmware and it is really hard for me to notice that much of a difference. I had been previously noticing loops drift, like many on here had mentioned. In fact, until I read about on there, I kept thinking my beat matching was crap since I was constantly adjusting loops. As soon as master tempo got turned off, loops held. Right now I toyed with two exact loops, one with master tempo engaged, and one without. I had them perfectly synched, nice flanger due to phasing, didn't hear any pulling apart of the two loop. For my own curiosity tried the same thing at +2/4 percent.
I am still not totally sure if I am hearing what I want to hear, or if the firmware is actually improved. Hindsight, I should have updated one player for direct comparison.