I use the Dawsons for competition for USPSA limited division. They are excellent for that and better than the TTI basepads in my opinion (I have both).
I would not use any of these +5/6 extensions for carry. The springs in them are not strong enough to maintain tension for long if left fully loaded day in and day out. I have to replace springs every 6 months to a year on my competition mags and I don't use them that often.