We have been using Tall Emu for 5 months.
In concept it is great and has streamlined our quoting, supplier purchasing and invoicing. In practice we have had periods plagued by MYOB sync. errors that sometimes last for hours, sometimes for days. This is incredibly frustrating. We are in the middle of one now that has had us intermittently disconnected over 3 days.
We can invoice/receive payments in Tall Emu then not have the data transferred to MYOB which prevents us from allocating bank deposits etc. I believe reverting back to invoicing in MYOB would throw stock levels out because Tall Emu is now the stock "master" and the sync is only one way.
Tall Emu is not yet up to the reliability standards of AccountRight and ironically, given it is now an MYOB product, its biggest weakness is its MYOB integration.
We will see out the subscription period, having put a lot of time and effort into learning the system, and decide then whether to continue then.