I purchased this lifetime deal and got around to activating it a little more than a month later. The AppSumo instructions are pretty clear on how to redeem the code -- you simply create an account, login, click settings, and then click the "Upgrade with promo code" option where you can apply the code.

Easy as pie, right? Nope, more like as hard as a rock to the head. I go through the elaborate sign up sequence and eventually get to log into the system, but when I go to settings the upgrade option isn't there. So I see a plan section, most service would label this as billing, and it my current free tier plan... but still no upgrade option. I turn over every pebble to find out where to redeem my AppSumo code and the upgrade option is no where in sight. It's almost as if the service wasn't expecting anyone to apply the code after a month so they took it out or, the cynic in me is thinking that, they were hoping to catch last minute AppSumo redeemers off guard.
So what next? I do as the AppSumo redemption page instructs and send an email to Rock support. The result was radio silence.
So based on my experience with Rock's poor support for AppSumo members and unresponsive customer service I decided to skip this rock into into a lake and move on to requesting a refund.