I'm using iBank 4.
I had been using Quicken 2006 for Mac, but the various timebombed features (particularly downloading data for reconciliation) were stopping, and as of 2011 there were no viable alternatives available. (Quicken Essentials could import all the data, but couldn't track stock or fund activity to the point where I could comply with the US tax code. And at this point I had serious doubts about how long Quicken's support would last.) The final straw was when Apple dropped support for the old PPC emulator software, which meant that the 6 year old software wouldn't function on newer Macs.
I tested a bunch of alternatives, where my criteria were:
1) decent electronic 'checkbook'
2) be able to display my balance in various accounts (no, seriously. There was one piece of software that couldn't even do this.)
3) Track buy and sell prices for mutual funds and stocks, to the point where I could use the information for my US tax returns.
4) Import my existing data from Quicken directly or through an exchange format Quicken could generate.
iBank 4 won. It was able to import all my historical data exported from Quicken 2006 in QFX format, for a dozen accounts going back 18 years. Yes, I had to spend a couple of hours doing fixups afterward, mostly changing stock sales from 'Sell' to 'Sell to Close' so all my old data related to employee stock options would produce the right result. It's different from Quicken, and feels slightly less polished, but it gets the job done. Oh, and unlike Quicken it is actually supported...