I have never personally used it, but I know a local grocer who does. They seem very friendly and I'm sure that they'd be willing to answer an email. Here is their website:
The have contact info on there.
Adrian: Thanks for the posting. Very insightful indeed. In looking at systems, have you looked at Microsoft Dynamics, which is Microsoft's POS system?
I second Matt's comments about being careful to find a POS that works in a cafe environment. I've looked at a ton of them in preparation for opening my coffeehouse and many are geared to retail environments, not quick-serve F&B operations. Although I too am an Apple fan, I have unfortunately yet to run across an Apple/Mac based system that is easily tailored to quick-serve and has all the bells and whistles I require. If there's one out there that matches the functionality of the Windows based systems I've seen, I'd be interested in reviewing it too.
.... In my coffeehouse I will probably be using a Windows based POS, but plan to run the back office (reporting/config) modules on a Mac that is also running Windows. This way I will be able to use my Mac for all my non-POS related tasks and also use it to administer the POS when necessary.