dripless shaft seal?

Last Saturday I hit a massive submerged log, which killed my Acme 1235 (man, did I love that prop) and separated my drive shaft from the transmission. (Don't really know the specifics of the damage yet. My mechanic is gonna look at it on Friday - this is one job I'm not gonna do.) If I'm ever gonna switch to a dripless shaft seal, now is the time. I've never had any real problems with my packing nut, but I keep my boat in a slip so a dripless shaft seal is kind of appealing. I'd really appreciate hearing from anyone who has made the switch - basically whether you'd do it again. Thanks guys!