I'd rather sign someone like Denzel Perryman if the price tag is in the same ball park, and/or draft a linebacker.
Roberts was okay at times, nothing special. And more importantly, it doesn't appear as though he'll be ready for the start of the season. If he's looking for a one year, minimum type salary + incentives, then that's fine. Otherwise, no thanks. I feel the same way about Godchaux, but I suspect he'll be able to land a longer deal with better money.