Recently–and this is why I love web-based software–they upgraded their service. They addressed my three major issues with the service–you can now track invoices, change currencies on a per-invoice basis, and see totals for any invoice view. I didn’t have to do or pay anything, and the service got better. How often does that happen?
Of course, I’ve already spotted a bug with the upgrade. When you enter an invoice date that doesn’t exist–say, February 30–the app errors out very ungracefully.