I had a good chat with Tom McDougall who works with Asplundh Tauranga about Tachyon and other climbing gear earlier this afternoon - we got to talking about the Wolf Claw tree climbers. Buckingham Bashlin and Klein are the most well known in this arena and are all very similar in their approach.
The Wolf Claw is quite different in that it is more 'boot-like'. You step into it and the hard shell 'boot' eliminates the tendency for harnesses to rotateon the foot meaning more comfort for the user. Next month Treetools will have a unit for testing - contact us if you would like to give them a try.