Autodesk Revit

How hard is this to learn for someone who is used to using Autodesk Arch. Desktop 3.3 (Acad 2002). We used the Details program for our structural shapes (the one you installed seperately), which is now present via the Detail Component Manager (took a while to find,) but will be using straight Autocad at my new job with a non-ADT library for structural shapes.
How good is it at what it's supposed to do for that matter? How does it work with Autocad and what should I keep in mind?

Revit has a few things peculiar to it and therefore different from A'Cad. It's great for getting the building model put together quickly.
I was told by a reseller that it's best kept to 1:50 and above views and to integrate A'Cad details below that. A complete project can be kept within one Revit file and multiple users can work together at the same time.
I suspect that if you're familiar with Arch Desktop then you should pick Revit up quickly and vice versa.
Regards.
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Revit is great and will put out a complete set of plans. I sometimes pull in detail sheets that I have pre-made in ADT, but one day I will convert all those to Revit details. The bottom line is Revit IS NOT CAD. It is a database driven building information modeling system. The greatest aspect of it is that it is designed and made by architects. So the process flows and organization are, for the most part, intuitive. One important requirement is that you must know how a building, residential or commercial, is put together. A few firms attempting to integrate or change over to Revit have found that it requires a lot more instruction for some of their CAD techs. This is because the CAD techs are great are drawing whatever the engineer or architect gives them to produce in 2D lines and text. But, Revit is true modeling I that it is building in all the features necessary to tie all the parts together as you model the structure. AutoCAD is vector lines and text, Revit is database objects.