I just discovered this KAL a week ago - had to try it! Here's my first effort. Trekking XXL, 2 balls, size 8 needles. Did the amount of increases called for in the pattern, but did a total of 24(!) repeats of the straight rows. Ran a bit short of yarn at the end - instead of frogging, just decreased a little faster. Tossed it in the washing machine, then the dryer. It came out so soft, but here's a hint - don't dry your Clap in the same load as, say, a bra... the hooks made two pulls that I haven't figured out how to fix.
Total cost - $22.00. On the needles for seven days.