If I understand the offering, this is great. The differentiator seems to be the ability to use your current deployment tool to set up the test environment, meaning it's a lot closer to your real production environment.

I recently spent a reasonable amount of time looking for a hosted CI solution that would run the particular version of postgis we use, rather than the 'latest and greatest,' but it seems like a lot of the current offerings have fairly limited flexibility in build environments (understandably I suppose.)