We use it and like being able to do it in house. It does have some limitations and there doesn't seem to be any work to make it better. IS Tech does provide tax table updates but I don't think they intend on providing upgrades unless there was a major change in tax code or something.  
 
One limitation is doing complex employer contributions on a user deduction. It only allows a straight percentage for the employer match on a 401k deduction. Today a safe harbor match like 100% of the first 3 percent of salary and 50% of the next 2 percent of salary, is popular. We do 100% of the first 3 percent through the program and then the TPA calculates the remainder and we deposit at a later date.
 
We use crystal reports for many reports so that isn't an issue. The 941 report and subject to report will give you most of what you need at tax time. If you have specific questions I will try to help.

No, we don't do direct deposits yet.