depends on how abusive you are being , I can easily shift 2nd thru 6th without using the clutch , its all about timing , you rev it out and just as the revs fall off thats when you click it to the next gear , especially helpfull if your drag racing someone , plus it teaches you to let off the throttle just a bit , cause if you don't and you grab a handfull of clutch you over rev the sh*t out of it and then your either slowing down to drop the revs before letting out the clutch OR you are staring at Jesus and you have a blaster laying on top of you . Should you do it all the time , no , but in certain situations where shifting without the clutch will be beneficial , then its fine .