A lot of (typical, macho, non-skin care) guys are starting to hear about the Clairsonic and it definitely appeals to their love of gadgets. They just sometimes need a little reassurance that it's not a "girl thing", but if you compare it to a sonic toothbrush, they'll feel better about it.
You can also hint around that it's great for dealing with ingrown beard hairs and/or keeping the skin really clean, but you need to play up the high tech gadget angle first!
One thing I've noticed after using mine for a few years now - combined with a good serum/moisturizer, it's helped rehydrate my skin to a much more youthful level - I attribute this to just a vastly improved blood circulation in my facial skin. It's worth every single penny, many times over!