Warning #1 - despite it supposedly working on Mac, they have not updated it for 10.6 (Snow Leopard) and it seems that they will not. So cannot use on our "primary" machine.
Warning #2 - we had several issues installing it on a WinXP machine, but it worked after some fiddling. Like some other Learning Company titles it wants to install things that it should not have to; like Adobe Reader (without asking).
Warning #3 - it seems to be unsupported now. Cannot register on the [...] web site
It is working for us for now on the XP machine, but if I have trouble, I suspect I am sunk.
