I really like the i-Stubble trimmer because it's got a wide range of comb guide lengths that are easily adjustable by the push of a button. The device is comfortable to use and provides as close a shave as I need it to. I also like the little screen on it that tells you how much time there is left before it runs out of battery, as well as the length of the comb guide - it's super useful to know how much time I'll have with it before it runs out.
All in all a good product, and I recommend it!

Apart from having an easy adjustment of the cutting length, this beard trimmer really has nothing else to offer.

The cutting head is at a weird angle with a spring tensioning device that holds the head against the skin. The spring is too loose and does not make sufficient contact with the skin, leaving the trim job lacking.

The battery life is woeful. Not even enough for a touch up, let alone a full beard trim back to length.

It comes with no attachments for any other facial grooming so if you're looking for a multi-groom device then this is not for you.