I like that it has all my invoices in one place so i can see what is coming up next month or this week without having too many things open at once! It's really easy for me as an Accountant/Admin person who doesn't do much coding but just wants something simple out there if needed.
The interface could be better - some parts are hard to navigate sometimes especially when you need more information than they give us access to (which isn't often). Also we have trouble logging into our site account from outside Canada due to how secure everything seems nowdays. Make sure your system will support Canadian VAT rates before using because otherwise its going ot cost about $1k per year extra each time someone visits the website outside CANADA!! We use this software mainly within accounting department only however since moving away form SAP Business One last summer everyone uses UU instead unless doing specific.