It's as usable as the old scaffolding, if that is your concern. Well, there are just two issues, which ironically are present when using a HTML5-capable browser:
- HTML5 overrides the messages.properties
(as explained here)
- Input of type="number"may lead to some problems
(like in this question)
Other than that is fine =)
Oh, and one last thing, it also includes CSS3 but that is just eye-candy like box-shadow and even when using a no-CSS3 browser scaffolding views look nice.