I just installed the 8.302 update AND the 825 maps on my 920, and so far, so good.
Last Friday, I took a little trip with my 8.3 firmware and 725 maps and had terrible stuttering. I noticed that it'd clear up for a while if I pulled the power cord out of the TomTom, but after plugging it back in, the stutter started up again after a few minutes.
Today, with the new firmware and map, I took the same trip, and no stuttering!
I realize that 1 test does't confirm that they've fixed the problem, but for me at least, it's promising.
Last Friday, I took a little trip with my 8.3 firmware and 725 maps and had terrible stuttering. I noticed that it'd clear up for a while if I pulled the power cord out of the TomTom, but after plugging it back in, the stutter started up again after a few minutes.
Today, with the new firmware and map, I took the same trip, and no stuttering!
I realize that 1 test does't confirm that they've fixed the problem, but for me at least, it's promising.