Dave Oliver posted a nice review of Task2Gather for Windows Mobile. The review seems to be just to the point covering all important features of the application. Besides the author singles out not only good points of the application but also some of the drawbacks:
As a day-to-day task manager, it’s probably a little cumbersome – you’d be better off with TasksPlus or Remember The Milk. But for organising projects it makes perfect sense - it’s easy to set up and use, you can organise new or existing projects on the hoof and discuss them with your colleagues as you go. Notifications and alerts would make it more useful, with an alarm or an email to inform you of changes, but even so, it’s a decent, no-frills project organiser.
If you got interested you can read a whole review here.