In reply to Landy_Dom:
I've trialled these for work purposes, as well as the Heightec Manta and Kong Back-up, which work on very similar lines. The Kong one is a bit smaller and has a neat switch to activate the spring on the cam.
They all comply with the Industrial Back-up standard EN 12841A. A Shunt will not pass this standard for a few reasons - strength being a big one. Loaded against a knot a Shunt will release the rope at 4-5kN. So strength is one advantage of these devices over a Shunt.
Other than that any other advantages will come down to personal preference, as with a Shunt you will be using it outside manufacturer's recommendations so don't expect any guidance. Petzl of course recommend using a toothed device like a Basic ascender or Mini traxion.
Personally I'd leave these devices to rope access and use a Mini/ micro traxion. For me the increase in safety from a toothed device (much harder to override it accidentally, eg by grabbing the body) far outweigh any issues of rope damage from the teeth. You still need a second device for descending whichever option you go for.