Review (4/5): Excellent concept and product, but with ultimately fatal design flaws.
I've had this trimmer for a little over a year, and prior to this I'd been using a similar product by Norelco, so I came to love the vacuum concept. This product does what you'd expect it to, and it does it well: Trim your beard (or hair, if you're patient) and vacuum up the trimmings. It doesn't catch 100%, but it gets pretty close. In general, it's a worthwhile product.
However, it is fair to mention one fatal flaw with this design: the vacuum door hinge. It is constructed of brittle plastic, and the hinge crumbled on me after 15 months of use. I have since decided to try a non-vacuum product by Wahl. If Norelco could change the design of the trimming area to eliminate the hinged door design -- say a small cup that you snap out and empty instead -- then this product would be flawless and guaranteed to last for years. As it stands, I'm going to wait for this product to evolve a little further before purchasing from Norelco again -- unless a competitor comes up with an improved design first!