It's super flexible, pretty intuitive for non-accountants to use and be successful with. The reporting is very flexible, allowing you to create a number of reports. It has audit tracking to see the history of how activities and entries have been made. It's the accounting product that's easily understood from CPAs, to bookkeepers, to newbies, to practitioners.
It does not have a lot of great internal controls built in—it's flexibility can become it's weakness if you ever try to perform a thorough review and audit tracking (it has this, but limited), it's not as robust as a full-blown accounting system. Not a terrible thing, but the offset of having so much flexibility.
Otherwise I think it's pretty good.
This is definitely something to evaluate. However, do consider all the aspects (donor management, donor relationship, asset tracking, etc.) that you'll need. This will satisfy the accounting, but it may not be the best bet for everything...everyone can only do some many things really well. After that, you should think of the best of breeds so you don't have to suffer through one module that really sucks.
QuickBooks is notorious for having a million different differentiated products which all perform nearly the same identical process. However, you need to be mindful of this as there's a nonprofit version, a for profit version, add ons, different versions (2015 edition, 2016 edition, etc.), Premier, Pro, Enterprise, Online, etc.
Intuit obviously has not read that offering fewer products can make more sales :)