In reply to Toerag:
The chunkier the sole the more weight - it's all compromise. The review does mention that they can be slippy on wet grass:
http://goo.gl/jBqr6f but James was so bowled over by their climbing capabilities he didn't seem to care!
The new style 5.10 Guide Tennie has had the tread beefed up if you want to take a look:
http://goo.gl/KM4nbg and it may also be worth keeping an eye out for the next version of the Camp Four.