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Weird. My experience is exactly the opposite. I hardly have a climber's physique - more puncheur/fat bastard depending on how polite you want to be - but I've ridden those wheels for 15 miles with an absolutely flat rear tyre (forgot my pump) and they shrugged it off no problem. Never needed truing, still running dead true after 4000 miles, mostly over roads which are so bad that one chap's saddle came off last time we raced a TT on them.
Hhhmmm, contentious. There are rims I'd rather have, but the A23s on my factory Powertap wheels have behaved themselves perfectly well. Definitely not the worst rims that I've ever used.