I like to use Quick Books on Line. My account can alwas have access to it and I don't need to worry about baking it up. After you get a larger number of contacts the other Quick books can slow down.
I started using QuickBooks when it was still in a DOS format!
We upgraded to the Windows format in 1995. We just upgraded to Pro 2009 last month. Everything from ’95 on is in one file I can pull up a 13 year P & L statement in just a few seconds!
I have not found much difference in the last few upgrades.