I first started with a 7290, then a 7100. SureType was fine (since I was used to T9 from past phones) but I couldn't get over the use of "see/are."
Not really SureType's fault, since the key combo can result in either, but then it meant that I would always accidently have "I'll are you later."
I was happy to get the 8700 which is slimmer than the 72xx series. I can type one-handed on my 8700 if I have to, but it would be easier on the 7130.