You are going to love it! The software last forever! Started learning cadd software with another that started with "a". Then had a tough time switching over to Microstation but once you get used to it, you start to appreciate what it is setup this way.
What I find very useful are the ease of customizing your own commands with keyboards and functions keys, let's admit it, everyone wants a little something special for their own while still can work together a whole. Ability to rotate view with just one-button - function key, or keyboard, abosolutely blows my mind. Folks who heavy CADD users will definitely appreciate this feature. If you can save one or two mouse clicks with every commands, it's a life saving tools. One doesn't have to be a programmer to make their own custom commands, it's that easy.
I also use Inroads quite often. Having the ability open multiple boxes related to Inroads really helps than line by line by commands, again this is more on personal preferences. With the new Open Roads, it's definitely a game changer, a change for the better.
For some who prefer icons to work with, the setups are just as easy to pick from.
In all, it depends on what your clients prefer!