We've been using Repairshopr for about 2 years now. I agree, I would love to have some sort of way to do ACH withdrawals. I haven't used the sign in options yet, but its something I'm looking at setting up. The one thing that really bothers me with RS is there is no real option to switch credit card providers.
When we first signed up, it took us months to move all our recurring charges from our old system, into Repairshopr, which we set up with Stripe.
A few months later, they launched "Mercury payments" (which i believe is now called Vantiv) which has a lower rate. It's also the only CC processor you can use through the smartphone app. The problem, From what I can tell, there is no way to run 2 CC processors at one time. So there isn't a way to do a slow transition to a new CC provider. The only option I see to make the move would be for us to remove ALL of our stored credit cards, Turn off Stripe, turn on Vantiv, and put all the credit cards back in. There is no feasible way for me to do this as I have a few hundred credit cards stored.