Task-Mate is one part project management, one part to-do list, and one part collaboration tool. Sort of the Jack of All Trades for time management, mastering none.
When working alone, Task-Mate is a fair to-do manager and project management tool, but doesn't really shine at either job. Most of the tools you expect to see are there, but the interface is a little awkward at times. For the single user or freelancer, there are better solutions than Task-Mate.
For collaborations and small to medium-sized project management, though, Task-Mate is much better. The free service (Bronze, allowing up to 5 projects) will get things done for most small teams. If you're a freelancer or part of a small project team of 3-5 people, then Task-Mate is probably a good solution for you. Not the best, maybe, but pretty good.
File sharing requires a paid subscription, but they start at only $25/month, so it's reasonable. Honestly, though, there are other tools that we've reviewed here at sCommerce.com before that were better-suited for full project management on a mid-sized or larger scale. Still, Task-Mate's free service does have the options most will need if file sharing isn't a concern.
Whether you choose to go with the Bronze package (free) or try a 30-day trial on a paid subscription, you have little to lose by trying Task-Mate. For some, it might be the perfect solution. In my assessment, though, I've seen better solutions at similar prices. If you're a solo freelancer, there are definitely better task management solutions than this.