Review (4/5): Much Better Than Earlier Model
I replaced my T770 model after the battery died for good. The T770 did a fair job of trimming and a terrible job of collecting the hair via the vacuum missing a good 30% of the hair.
This model is much better at the main job which is trimming the beard. It is very precise and trims the hair effortlessly.
The vacuum feature is improved and only misses about 10% of the hair now. However, it seems that if you are going to have to clean up any hair why bother with a vacuum feature at all. Cleaning up is cleaning up. It makes little difference cleaning up a little or a lot hair.