Review (2/5): Don't buy it for the vacuum
This popped up in my gold box, and I decided to give it a whirl since the idea of trimming my beard with no mess had a lot of appeal. The vacuum does half work. Unfortunately, catching half the mess won't change the need for clean-up--there's less to clean, but you'll still need to do it. So my main recommendation is that you shouldn't let the vacuum "feature" be your reason for buying this. If anything, it's a slight negative, because the opening for the vacuum gets in the way when you are doing edge trimming without the attachment.
The next down-side is the "memory" rechargeable batteries. Basically, unless you let the batteries completely discharge before recharging, they will hold less and less charge each time. This is mentioned in the folded up piece of paper that passes for a manual--you will want to read through that. Which leads me to my final gripe: That piece of paper is extremely poorly done--diagrams with no explaination, unclear instructions, etc. So you do have to read it, but you're going to spend some time trying to puzzle it out before you actually figure it out.
For all my complaining, the trimmer isn't completely without merit. It does do a decent job of trimming my beard, which is of course the main point of the thing. I also didn't have any real noise complaints, which seems to be an issue for other reviewers.
On balance though, my main recommendation would be don't pay for the vacuum, because you won't be getting what you paid for.