I have this condition, though in some respects I'm not as badly affected physically as some, yet emotionally I seem to have carried a heavier bag!
The diversity within Klinefelter Syndrome (KS) itself is far greater than the 'blueprint' that is used by GP's to define the physical picture of a KS sufferer. Typically the 'blueprint' suggests that we have small heads, an arm span that is greater than our height and that we are all extremely tall people with a tendancy towards a slightly lower IQ than normal. We are also supposed to be incapable of shaving and have boyish voices.
Well I'm 6' 3" my arm span is normal for my height, my head is bigger than average and my IQ at 141 puts me higher than average. IQ by the way only measures a persons intellectual potiential it does not make anyone superior. I suppose the easiest way to explain puberty or rather what it was like for me, if only because I don't seem to be typical, is to say it arrived early. Then it went to sleep for a few years and then re-awoke with a frantic start before running off into the distance.