I'm using hot rods on a motor making over 10x the HP of what a stock banshee does. no problems in 4yrs... Just look at how many OEM cranks are on ebay with bad rods.. they all fail. And last I checked.. OEM dont make 115mm rods.. soooo.. what ya gonna do? Pick the best you can and hope for the best..
as for the sled reference.. that guy added 30% more power.. if you add the same % increase to a banshee you get 40 HP. People are adding well over 200% HP to these motors. Thats like asking that sleds stock crank to handle over 450HP with no modifications.. dont see that happening. The cranks from the sleds use larger bearings.. bigger rods.. all around beefier. Again.. sled comparison is not a good reference... Compare a MXZ800 crank next to a banshee crank.. Its HUGE! gotta compare apples to apples..
I've seen stock motors go 15yrs.. No way is a 80hp bike lasting that long (unless you never ride it). You want reliable.. keep it stock.. You want more power, Start rolling the dice.. the more you add.. the greater the odds of a failure. I'm done.