I don't think the autoclutch is a substitute, especially if they haven't learned how to clutch first. I put an EFM in 2 months ago, but it doesn't take the place of using the clutch or shifting in all circumstances. if you don't know how to shift properly, it will burn your clutch out quickly. Heck, a friend had one in his 400sx and burned the clutch during the quicksilver...
the main benefits I see, and the reason I bought it, are two:
on those occasions in really knarly, nasty stuff where something such as a rock, root or quick turn, where I don't have time to shift, or lose balance for a sec or whatever, I don't have to worry about slipping the clutch to keep from stalling, which is much more difficult on a ktm than other bikes I've ridden, you just give it gas and worry about other things.
second reason is I never found a good position for my rear brake lever, whether standing or sitting, so I now have a rear brake lever mounted as my main lever on the left bar, with the clutch lever ahead. this allows me to lock up the rear wheel and keep my foot out on the right side if necessary, or lock the rear wheel into a turn and not have it stall.
some people think it's cheating, it's not fair...that's ok. It's not perfect. I can't bump start my bike so if it stalls, I have to kick it. There is just a bit too much drag I haven't gotten out of it yet, and I do believe the more lazy you are the faster you will burn a clutch.
normal operation won't use the clutch any more than before, but becuase of the occasional slips from the use of the efm, if the clutch only lasts a year that's fine, I don't mind replacing it.
I also have brp 18's on my bike, and it turns easier...not taking them off either....or the wer, or the...
anyway, those are the pro's and con's as I've seen so far. I don't need any practice clutching and shifting, did plenty of that when I was roadracing, and still do on my other bike....
oh, and EFM is only 500 if you say you are using the woodsracer.com group buy.....
and you can go back to stock for around 60 dollars if you want.