Initial impression, the account name, site subdomain, and user name are all quite redundant. At best, why not just use username, and subdomain?

However, the interface is VERY impressive, and very responsive. I love that you can see your weekly total, and daily total in the main navigation toolbar. At a glance, that helps out a lot. I haven't yet produced enough time for an invoice, so I'm not sure if it can create invoices so far, but so far I am very impressed. This might persuade me to move from FreshBooks.