What we like about is that you are paying somebody to secure your data. You don't have to worry about backups etc.
You can have more than one person and more than one company.
We also like the fact that we don't have to buy support contracts or other licenses every year.
Accountants love it as it makes their work simple.
It just works. Last night it sent out close to 2,000 invoices for our uncapped customers without us having to lift a finger.
Our other company generates about 10 invoices a month. It works just as well for that.