Very excited to see these kind of improvements. Coming from Rails to Django I've been a bit disappointed in the amount of things provided out of the box for a SaaS app (the main exception being of course the admin). Even in the ecosystem, I find packages to be a bit more messy and less production-ready than in Rails. Granted I'm fairly new to it, and the design philosophies are different
I am not a maintainer and I just tried it briefly so I am not 100% sure of the allegations they make on their front-page, but it seems like http://gridstylesheets.org are using Workers to run their layout algorithm (Cassowary Constraint Solver) and absolute-position elements (using 3D transforms).
As you folks are based in Paris, it would be nice to have proper contact details and an imprint. Can't find either. Reference: Loi n° 2004-575 du 21 juin 2004 pour la confiance dans l'économie numérique (LCEN).
Ah sorry, that was whois based. Anyway, my feedback on the site is: no idea who's behind it and no word about the team or the organisation/company behind it. Landing pages convert better, if this is clear.
Other than that, the offering looks great.
Edit: If I google your company, it's currently incorparated in Paris, France.
I use it too, but I must admit to wishing they would make it compatible with Google Authenticator or some other OATH implementation. SMS'ed text codes take way too long to be a good second-step when you're having to login everyday like I do (not to mention logging in from work where my reception is almost nil).