I wonder if the bugs noted here have been quietly fixed, because I don't see any problems. Using Quicken 2006 on Crossover 6.2.0 on Ubuntu 7.10 Gutsy, I was able to do a one-step update from both USAA (10 accounts) and Fidelity (2 accounts). All accounts downloaded correctly and automatically with no omissions or duplications, and with correct start dates. That was what kept me from using G... or M... programs on Linux: downloads were nonexistent or incorrect in impossibly annoying ways. Quicken just works -- but of course they invented their whole banking download protocol. I've used Quicken since it first came out, starting on my old Apple II+. Financial records are a deal-stopper for me in moving to Linux as my full-time desktop. I'd love to see an open-source program that could do what Quicken does, but for now, CrossOver at least allows me to say good-bye to Bill Gates. Thanks for the memories, Bill!
Some gotchas: be sure to install Quicken through CrossOver and not by just inserting the Quicken CD. Go to Applications > Crossover > Install Windows Software > Quicken 2006 and follow instructions from there. I did get one error saying Crossover could not "reboot Windows" because it could not close Quicken; turned out I'd failed to close a Quicken internet browser window that was still thanking me for my business. (Thanks, Codeweavers, for a helpful error message!) Ran through the install again (very quickly this time) and all was well. Intuit allowed me to re-register Quicken even though my old Quicken.com login didn't work (wrong password or it had expired, not sure which). Then they allowed me to update Quicken to R5. Once it was properly installed it worked just like always, and about as fast as I remember (which by the way is far slower than on the Apple II+. Back then it really deserved to be called "Quicken". Now it's bloated and slow, but it has me handcuffed to it.)
I recommend you try it. I think you'll like it.
--Steve