We have been using aACE since 2009 and it has been a major improvement over QuickBooks.
Value for Money
It is very easy to use and at the same time a very comprehensive and versatile product.
It does just about anything you could need, we needed builds, i.e. a sale item that is composed of several other items, to keep our inventory straight. Probably the biggest advantage is that my accountant can directly access our server and get what she needs when she needs it. It is overall very easy to use and we have over 800 SKU's so that is important.
Outside of some very minor spelling and syntax errors I really cannot complain. It would be nice if some of the features were easier to access (deeper features like certain reports) but it is overall pretty easy to use.