A quick test on Exceed. Done by removing Prides (to make damage more consistent) and replacing slvl20 Ixid Blade with a slvl20 FLB Gluttony Lance.
tl;dr;
272+195+190+266+318+900 2141
286+199+205+298+339+964 2291 ~7% increase
About as expected (if memory serves I was expecting a 6% increase). The value of Exceed lies in the increased damage cap, but for those who don't reach it, Exceed is merely an okay stat. In other words, it's only AMAZING for whales. Everyone else will still use them, but only because they just happen to be on the few FLB weapons they can get their hands on.
This does leave me baffled on Bear's video, where he was slamming 1.5m damage when he absolutely should not have, though.