I'm a recent convert from Windows to Mac and a long time user of Quicken financial software. I've transferred all of my financial data to iBank4. The conversion process and importing of data went fairly well, but still, I put a lot of time and effort into getting things just right. iBank4 does allow you to work with different currencies, although I personally haven't used that feature. There are some quirks for sure in the program and I'd suggest you spend some time in the user forums for iBank to get a feel for them.
My take on it is that Quicken just seemed to be going downhill and I could no longer do downloads with the version I had, even though the program did everything I wanted it to. You have to upgrade every 3 years with Quicken or they pull the plug on downloads. Reviews of the latest version of Quicken implied they had taken away reports and made other unfavorable changes. iBank (IGG software) at least seems to be trying to get things right and make improvements. It's not exactly cheap and takes a while to get used to, but now that I've been running on it for a few months, I can do all the things I need to do to keep my financial affairs in order.