I've been using Dlubal RFEM for almost 10 years (version 5 and then version 6), and can't recommend it highly enough.
The software is ergonomic and intuitive, which simplifies modeling and calculation. Support is very responsive, whether by e-mail or telephone. Updates are regular and development is ongoing, which means that new features are regularly available. Version 6 has given me a significant productivity boost. I think Dlubal is several steps ahead of the competition.