I haven't heard any complaints from Tower. I have talked briefly and generally with them about STAAD, since I had no experience with CAE programs before coming here. They know there're gaps in the program from what I can tell. They say that an engineer should know his/her design well enough to know what to expect, and if STAAD throws a curveball, or if you see something unexpected, you know to check it... but they never DON'T check STAAD's work.
They just upgradedd to STAAD 2006, so I don't think they have any plans on changing... but right now, I think it'd be too devistating on the company to have the engineers learn, or at least get used to, new software. We have 4 employees... the engineers and me. We're all working overtime and weekends pretty. A lot of our clients require some fast turnarounds now and then, and I think some hiccups in software that affects 75% of the company and 100% of the engineers would be costly at this point.
Maybe when we get some more engineers worth hiring and possibly someone with RISA 3D experience. I would like to see us go in that direction if it's two way with REVIT Structures... Revit structures, though, would be a ways off as well, so it wouldn't matter if we got RISA 3D soon.