I am using it for my IFR. I really like it. Only downside is you really need a paper copy of the figures and such. I bought the ASA book just for that, plus so I could study when I wasn't near the computer.
download their demo. Its the full program, but only allows you to see about 5% of the questions. It'll even let you print out great paper study guides, which I think are better than the ASA book. I use those printouts more than the ASA book
I also bought their logbook program, as they offer a great bundle of the logbook and one test.