Convert your Sprint Treo 650 for use on Verizon

Don't come crying to us if these guys permanently screw up your phone (or "disappear" with it), but if you don't mind a little warranty-voiding, someone on eBay is offering to convert your Sprint
Treo 650 for use on Verizon's network. They're asking fifty bucks (plus shipping), so if you feel saving some cash and giving it a shot yourself there are people who 
have been doing this on their own.