I too am joining the Treo generation - my 650 was ordered yesterday. My brother strongly recommends the insurance too (he is on his 4th Treo in 30 months). He's dropped it, lost it in a cab, and another wore out from overuse.
Work colleagues have mandated that I get a Blackberry (or similar product). So I opted for the Treo so I can ditch the Palm PDA and cellphone that I carry now. Work is paying for for 650 as well as paying for the phone coverage; I have to pay for the internet part of the bill.
The blog at the Treonauts site is also helpful, Dame. It also has reviews of accessories, software, etc to make your Treo experience all the better.