Ive been using the app for several months while at the same time i was using a web based service that cost $29.95 month - InvoiceASAP is definitely a better choice! On top of that they have an amazing response time to emailed questions - Im very happy with InvoiceASAP. ( I quickly canceled the other service.)
OC Redhead about Invoice ASAP: Mobile Invoicing, v6.2.0