Not so great on my HTC Dash...
Off-and-on again I've been using my HTC S620 (T-Mobile Dash) with the inbuilt Windows Mobile Task application. Guess what, I found it to be lousy and lacking for managing my contexts... so I've gotten back to paper and life's been great again.
I'm curious, though, anyone here using a listmanager with an HTC Dash? How did you set up to work with GTD? I've given up on trying to make it work for me.
By the way, in case anyone is interested, I've found MyNotes to be a cool list manager to use on my HTC. It's free and requires Java support. You can use to write notes, make lists and checklists. Other features include password protection and exporting/importing of notes. Much more flexible than the standard tasks app in WM!