I've used it twice, and I've had problems both times. The first year there was a bug that made a huge calculation error, and it took forever to get it fixed. The second time I wasn't able to file electronically and had to print an mail my return. What a pain!
The software is easy to use. I especially like the feature that checks your return to see if there is any reason to believe your return might result in an audit (mine never has).
Pros: Easy to prepare, Maximizes refund, Easy to import documents, Fast