Have you done any formal ROI on the move to Chargebee?

I moved from Chargify to Stripe about a year ago (to save on cost) and the biggest challenge was getting customers to re-enter their card details for Stripe.

I offered a coupon for 50% off a month's subscription to entice them to do so but still resulted in a couple of months of paying both Chargify and Stripe while I chased the errant customers.