Summary: I traded in the m505 for the m515, and I don't regret my decisions at all. with 16MB of internal RAM and the expansion card capability, this is one of the best color handhelds out there. Palm also solved the problem with a dim color screen with the m515 as it has a pretty bright screen now.
Summary: The newer T series Palm devices are really targeting the needs of current users. I have used the Sone Clie for years, and the Visor before that because I did not like the features and device size of the Palm product line.