I have two. Had them for years, they use a Sanford refill. I love them. Very good quality pen...but come to think of it I haven't seen them in my part of Canada for a couple of years.
Used to use one, but with my job, I am frequently dirty and sweaty, and the oils from my skin eventually softened the grip and it deteriorated.
There are a ton of ergonomic disposables available, so now for work I just use the Uniball 207 Gel.