I used it for a little while and Turnpike email software from the UKs Demon Internet integrated it pretty well.

The problem was only one other person I knew actually used it, it didn't really have a justifiable use for most people.

I did use the encrypted mountable drives for a while, that worked very well. I since moved to TrueCrypt and now onto Vercrypt and haven't used a PGP product for probably over 15 years.

Shame really but it just didn't get enough traction.