Transitioning from Windows to Linux became a challenge when it comes to Project Management software. I though nothing could beat MS Project and until finding RationalPlan, all the applications I tested were either buggy or seriously missing features.
It was a huge relief finding RationalPlan as (almost) all of the features I expected were there, and even more. The product is solid, extremely intuitive, extremely helpful and don't think this as unimportant, it looks good! Absolutely nothing to complain about on the usability front. It is very clear lots of investment has been made so the application is a doddle to use.
On thing it does not have and possibly rightfully so, automatic leveling. This is completely compensated by a flawless manual leveling interface. After using it for a while I started understanding the idea behind the decision of not doing auto leveling and it started making sense.
Moreover, it has excellent reports and I absolutely loved the fact that they are customizable so I can export them and send them directly to customers without having to worry about branding issues. Spectacular!
The other lovely feature is the fact that it makes it very easy to send emails concerning the project.
I have only tested the Single version, on which I got all this for free, but the prices are very acceptable as even the Multi version will take no one to bankruptcy. Even small companies should be able to afford it.
The bottom line is that I intend using it even if getting back to Windows. Amazing value!