I'd say hockey slo-mo is the most critical. Play is so fast and continuous. A lot of times on goals against I want to see how our D broke down, who let his man through, etc. They don't cover that in slo-mos much. On hockey goals it's only in slo-mo where you see how the puck got through. Also you want to go from slo-mo to still and back and forth sometimes. The TV guys don't do that much. Got a Sanyo VCR in 1980 with a slo-mo button and never had any vid recorder since that didn't have a dedicated slo-mo button...until crazy D* with their idiotic push-and-wait system.