I cant say i have been able to match up with any of the "A" series in quite a while
505a was good while i was in 16lb equipment and that was a while ago
607, 508, not to great
because of that, the 706a was not on my radar
Now, I do have a 300a with a 2" pin-pap and that is super smooth and arcing
Im gonna wait until i see someone with the 503a before i go through that again