I'm disappointed so far with Quickbooks Bill Pay. I used to use the Melio bill pay integration and was very happy with it.

But Quickbooks kicked out Melio and replaced it with their own similar service. But here are the differences that I'm not liking:

Melio was free. QB Bill Pay is at least $15/month for 40 ACH payment, and $90/month if you need more than 40.

Melio would send my vendor the remittance details (the list of invoices paid with the payment) via email. QB Bill Pay does not, and now my vendors are all emailing me asking what the payment covers. This is a headache, and I'm going to cancel QB Bill Pay if there is no way to include the remittance info.

Luckily, we can all still use Melio bill pay for free, but you have to go to their site to make the payments, and then it syncs back to QBO. 

If I'm mistaken about anything, please correct me!