The only problems you can run into with clutchless shifting is doing it wrong like Del said. If done improperly this can cause you to get that "false nuetral" more often than not and make it so you need a new gear assy sooner than you should.

You need to find the proper rpm range for your bike for the best shifting. If done properly there is ABSOLUTELY no harm done to ANY part of your tranny or clutch. None.

When shifting up you should be on the throttle accelerating as normal. Then start applying pressure to your shifter like you're trying to shift; don't touch the clutch. Then as you're trying to shift just let off of the throttle for a split instant. Your foot should then pop the bike into gear just fine. But you have to be forceful about it, don't be scared. Just shove it into gear; hard. If you don't it might pop out and give you that false nuetral.

For down shifting it's pretty much the opposite. Just start applying pressure with your foot to the shifter to down shift. Then blip the throttle and give it a little gas to again hit that perfect rpm range and you should downshift no problem.

Downshifting feels allot worse than it really is. Upshifting usually always feels smooth, but downshifting can feel harsh.

Just do it right and you shouldn't have any problems............