Do you have an iPhone app on the way? Currently I keep a Mint account for my business which I check frequently on my iPhone. That being said, Mint is just a toy for me; the real work gets done in Quickbooks.
Your pricing seems oddly segmented. Intuitively, I don't know how many transactions I run each month. I'm not even sure how I'd count them. I'm pretty sure it isn't more than 500, but who knows. At the 'enterprise' level (and I'm certainly not enterprise) I would have a tough time justifying a price nearly equivalent to buying a copy of Quickbooks Pro every single month. Especially when my accountant is still going to want a Quickbooks file to prepare my taxes.
"I would have a tough time justifying a price nearly equivalent to buying a copy of Quickbooks Pro every single month"
Three reasons why this pricing is clever:
1) The aim is to get you using the $30/month version, then when your business grows larger just start charging £100/month. It's so painful for a company to switch accounting software that they will gladly pay twice as much as if they had never heard of it before.
2) You can give out special offers like '25% off - only $75 per month'. This would probably sell better than a normal price of $75.
3) The £30 per month looks more attractive when it is placed directly next to a more expensive option.
Your pricing seems oddly segmented. Intuitively, I don't know how many transactions I run each month. I'm not even sure how I'd count them. I'm pretty sure it isn't more than 500, but who knows. At the 'enterprise' level (and I'm certainly not enterprise) I would have a tough time justifying a price nearly equivalent to buying a copy of Quickbooks Pro every single month. Especially when my accountant is still going to want a Quickbooks file to prepare my taxes.