I did recently drop from Essentials to Simple Start. We are a small, 2 person shop. The only differences noted in the matrix were 'Track Billable Hours by Customer' and 'Manage and Pay Bills from Vendors'. Neither option was necessary for our business. Having a PO# on the Invoice IS, however, critical to our business and I would venture to say critical to most businesses. I sincerely hope we don't have to pay an extra $270/year just to get PO# printed on our invoice??!!