Hi Eric Stone​,

- Presently Marketo offers the option to switch back and forth from Classic UI to sky and vise versa (as shown in the below snapshot)

I really doubt if all the rules would be wiped off in any scenario. And even in a scenario where something like that happens, based on the magnitude, support should be able to fix it, If and when something like that happens.

For the most part, I use Marketo Classic UI, but yes, the saved rules and the features mentioned in the above blog, most certainly makes using Marketo Sky interesting and helpful. I do encounter bugs at times, but I am hoping marketo is working on fixing those and they should be fixed by the time they plan a complete roll out of Sky. Although I am not sure of the time line as to when they are planning a complete switch because a lot of features are still Work in progress. So it might take some time.

Best Always,

Karan Hari