Just tried "the first one for free" link and one of the first steps into it is producing an error - select your template and we got a 404 error. Hopefully this gets fixed soon. It looks like it could be a pretty cool tool.
Thank you Pierce for your extremely prompt assistance. Very impressive! We are definitely looking forward to trying this out!
For others in this feed, it seemed to be a browser issue on our end. The site works fabulous.
I will say though, Gmail is a pain for responsive design as they do not support media queries, which is how emails are coded to suit different screen sizes. There are some workarounds, but it would be nice if gmail finally got with the times and supported this functionality.
You can check the solutions provided by Marketo partners onLaunchpoint for creating responsive emails that are tested across all devices.