I have started really focusing on deads as well. My 1RM is 475lbs right now, however, this is with straps. Ever since I have started doing a lot of rack pulls and deadlifts I have been wanting to increase my 1RM and I found my grip to be a limiting factor. Even my training partner would try some of the weights and he's got a stronger back and his grip would give out sometimes, albeit not all the time. This guy has pretty jacked forearms and has done a lot of grip work previously.
I'm all for having a super-strong grip but like any other thing in the gym it takes work and time and I really don't want my progress on deadlifts to be hindered by it so I have started using straps regularly. I also have started doing grip work but its going to take a while before it catches up, if ever.
My back workouts are just better with straps.