OP
As far as I know, LeisurePro are not official Scubapro dealers. They still sell their stuff but handle the warranty themselves. I can't vouch for how well their warranties work or how they get ahold of their stuff.
I have both the A700 and S600 and they're both great. They've updated the S600 to include a metal air barrel (which is also an upgrade option whenever you get an older S600 serviced.) The A700 is priced like a boutique regulator and it looks cool. The performance difference can be measured in the lab, but the difference that I've found is minimal. Either way, you end up with a top of the line regulator that, with service, should last you as long as people are using open circuit regs.
I have both the A700 and S600 and they're both great. They've updated the S600 to include a metal air barrel (which is also an upgrade option whenever you get an older S600 serviced.) The A700 is priced like a boutique regulator and it looks cool. The performance difference can be measured in the lab, but the difference that I've found is minimal. Either way, you end up with a top of the line regulator that, with service, should last you as long as people are using open circuit regs.