Wheatley Wares review for Invoice Falcon

The Invoice App fails to work as needed about once a month. Overlapping characters and text are a recurring problem that I have to call them to fix. Most recently, the App had difficulty loading and it took a minute for me to print an Invoice, instead of 10 seconds. It took 10 days for them to resolve the issue and that's just too long. I am now looking to see if I can find something more reliable.