In reply to Mr Lopez:
No, that was still be the case last week
It was 15 days, although was able to register by emailing them the info plus a photo of passport, so not too contorted.
I used these guys - deals seem to have changed a bit in the last month or two as they've expanded beyond France, but might be something there? They were easy to deal with - a couple of hitches (email with SIM PIN didn't arrive automatically, iPad set itself up with wrong APN settings - there's now a note about needing to write them down) but both were fixed quickly with an email to their customer service.
http://www.lefrenchmobile.com/en/data-bundles.html