Leaford did a great review of the epipe. The problem with them is the atomizer. On most models, it apparently is attached to the pipe so when it goes, you have to replace that whole pipe part, or
buy another kit. Litecigusa had them and the separate replacement part but it looks like they're still out of them.
If you can hold on, I heard Janty might be coming out with one in 2/09 that might be worth taking a look at. But if nothing else, you should at least see Leaford's review. You'll probably learn a lot from it.
Edited to add: Ha...he beat me to it! We were typing at the same time
Lu