Corepay has been great to work with! They are incredibly responsive in resolving any issues we have had or questions regarding our payroll needs. Our account manager was also very helpful when I needed additional help! There isn't anything specific about CorePay as far as being able to use other services like Quickbooks/Xero etc. It handles everything related to payroll for us so it really just makes life easier for me overall. We recently moved over from Sage X3 HRMS to CorePay but honestly there were no real differences between them. The only difference would be the price point - corepay seems more expensive than what we're used to paying through sage x3 though they do offer some discounts if you sign up early enough.