They are nowhere near as aggressive as a 300cc gas gas!Power is there, but not ridiculous.Ive even removed my flywheel weight that mine came with(2nd Hand).Have a go on one and make your own mind up.Positive points,airbox stays clean and dry so runs spot on all the time.Lots of power if needed.Well made.Ive had a few problems but mine was a previous loved/unloved bike.Fuel filter split and gearbox problem but all replaced under warranty upto a year old!Id have another!