Review (4/5): Decent product with one exception
I've been using the Philips Norelco T980 for the last couple months.
There's a wide range of length settings. The vacuum works very well. Battery life is good.
A couple times the 'length dial' moved by itself, changing the closeness in the middle of the shave/trim. I realized I might have been pressing too hard and actually pushed the mechanism down inadvertently. This problem would not happen with a fixed blade trimmer. Overall, I'm very pleased.
I've used this product exclusively for beard trimming, but tried trimming my head once. The vacuum didn't work very well and I would recommend trimming your head over the sink. Besides the mess, it did a very good job.