Back in the 1980s, my dad bought a pair of Molnars. They looked like the yellow pair, pictured above, but we're neon green. He handed them down to me in 1985 or so. They were so soft that after a year, the bindings became loose, and couldn't be remounted! Most skis lasted much longer, but they were a nice, soft ski, and good turners. The "groove" was on all skis (to my knowledge) of the time, and reduced chatter, absorbing the vibrations of rougher snow. Newer skis don't have the groove? I hadn't noticed. If so, the difference is probably related to the wider side curves and rounded shovels of today's skis.
I don't thinks our Molnars are worth much except for nostalgia or collecting. They were never tremendously popular or a big seller. Most people never heard of them.
My dad did tell me that the guy who developed them had something to do with the Moog synthesizer, and skiing was a hobby. The investment in a ski was related to the music business somehow, Maybe the money made in music allowed him to invest in the skis, or something.