I never owned one, but they were built from the ground up for SSB, AM was a option that required a external AM unit.I had a friend who had a stoner cb radio..... it was and probably still is all hype.... a 148 would run circles around it.
Everything I have read says better filtering in rx on SSB?
They were only rated for 10 watts SSB output so I see the 148 having a power advantage over the pro 40.
73
Jeff