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 email 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.