Been playing around with it and glad I took a look. This is a very solid application.
You can easily run a business with it. NOTE: there is none of the hand-holding and downloading of State and Federal data that QB has so when setting up Sales Tax, Income Tax and Payroll you need to know what numbers apply to you and what they are otherwise you could start a very nasty ball rolling down that hill of despair and late nights (do not ask how I know of this hill).
The machine I am using here is from 2009. The machine I was using for QB at the old store was from 2012 and much faster. GnuCash is downright peppy on this machine - much faster to go from one process to another than QB on the newer machine. Again, not as many bells and whistles - QuickBooks tries to be everything for everyone - but GnuCash has what is needed and is blisteringly fast.
Some comments in the forums say that designing forms - specifically custom invoices - is hard. We will see... Also, something nice is that all data is saved in an XML file but you also have the option to use a SQL database (this would be for multiple workstations and large volumes of data). It can export data to a QB compatible format so you can use TurboTax for online filing.
Check out GnuCash
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