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We currently use the Design informant aspect of the Deliverability Power Pack. We use it without any other subscriptions such as Litmus. You are able to see how the email renders across many different ESPs and devices. It also gives you tips for optimizing the email as well, its as simple as copying the HTML code and dropping it into Marketo. Lastly, you can see a SPAM audit of the email too. This is great to see before sending the email. Maybe not as robust but definitely a helpful tool, we love it.
Thanks, Chris! Glad to hear that you're using it without needing any other subscriptions.