I get 5.5 sec 0-60 from my slightly modded ba and a top speed of 105 mph.I weigh 245 lbs.The ba and speedy are no more underpowered then the 883 sportser hd is .I ride with a good friend who has a 1200 nightster and we routinely open them up,I have no problems whipping him up to 75 mph,then his bigger motor takes over but thats only for a bit.His top speed is no better then mine.I saw a review 2 months ago between the std bonny and the sportster 883 in a bike mag.The bonny won out on all counts.Apples to apples the trumps are as powerful in a usable sense as similar size cruiser,jap or american.Could you post a link to some of these reviews?