Review (2/5): The old T7500 was better
The moustache trimmer on the old T7500 was built-in and extremely convenient to use. On this one, you have to pull off the guide, then the cutter head, then stick on the moustache cutter. There's no place to even store the trimmer, so it's either rattling around in your drawer or the bottom of your toilet kit.
Also, I found it a lot harder to get a consistent length cut with the "Accu Control" flexing comb guide than with the fixed guide of the older unit. I keep my beard pretty short -- this might not be a problem with a longer beard.
So I returned the T970, and went back to my old T7500, even tho the battery no longer holds a charge and I have to run it off wall power.