I have used this product for several years as a solo performer, especially in bars and pubs.
It's well made, cans tan up to a few knocks and offers a range of useful audio features. If your acoustic doesn't have a built-in preamp, this is really useful for shaping your sound without having to fuss with the sound board or PA. For home recording it offers a good buffer for acoustic sound, especially if you're going DI.
There are a couple of caveats, however. This is obviously subjective, but in my use as a performer I find it awkward to set up and use. Unless you're going to set it on a pedalboard, with an independent power supply, getting it situated in your performance space is a pain without having cables all over the place and it doesn't do all that much to boost your passive pickups thorugh a PA (which is what I bought it for). Changing batteries is a bit inconvenient also.
I'm sure there are plenty of good applications for this, and plenty of people who would love it, but for my needs it just doesn't quite fit the bill.