I used all; so, I believe that I can say something:
=> Veer is very good same as "dumbphone", because his size is impressive. The keyboard is very nice, a big surprise.
=> Pre 2 is great! Many times, I believe that is the perfect size, and is very, very fast. The keyboard is not so good than Veer, but works very well.
=> Pre 3 is close to excellent! The "close" is there because there is some system bugs needing fix and; solved this, is fantastic. Beautiful, responsive, very good in one hand use only... I really like that guy.
The big problem; to me, is cannot share my Palm Profile between two phones, because I wanna have my SMS history and call log in both (or more) devices. (There is someway to do that? Share using Bluetooth as Touchpad & Pre 3 was something!)
Sometimes, is interesting use the Veer (when I go to stadium, see the Botafogo X Flamengo or when I go enjoy the night, for example) and; in others, is interesting use the Pre 3 (working everyday), but I only need the same content in any places... and I really missing this.