Argyll I use Alliant bill pay to pay off my monthly CC bills. I have found the Alliant service to be 100% reliable. When I request a bill be paid, it is paid, with never a glitch or failure so far. And that I something upon which I heavily rely and very much appreciate.
My only problem with the Alliant bill pay service is the dollar limits, which for me are severely restrictive.
Let me analogize:
At Alliant the overnight ACH funds movements are equally reliable as bill pay. But the dollar limits, since they were reined in several years ago, can at times be problematic.
I finally found, at PurePoint, equally great ACH funds movement reliability without the dollar restrictions Alliant now imposes. Sure wish PurePoint would do for bill payments what they have done for ACH. But PurePoint does not even offer a bill pay service.