well, as i said, i tried them today at the very beginning of my workout today. i only warmed up with 3 sets of 3 or so pullups (controlled/moderately slow). i was able to bang out 4 clap pullups (without coming down off the bar). actually, i was able to get my hands together every rep, but only the second rep was i able to make a distinct clapping sound (a bit quiet tho). it's been rainy here, so the humidity is up, and the bar in the gym was a bit slippery than normal (plus this bar has no knurling) making it a bit more difficult. this is definitely not an easy move and i see it becoming a regular part of my routine. 
j2da2

j2da2