Nice yak! Yeah a trolley anchor is pretty much indispensable IMO. I've been looking at the Jackson Kilroy myself. It's a hybrid between a sit-in and sit-on. Here's a link to the walkthrough for anyone interested.[youtube]http://www.youtube.com/watch?v=mMZhNK2Jpec&list=tDLRBQGvjWcSg5WYGfRC3mM2AT8yptQD&index=0&feature=plcp[/youtube]
Also if you look at the video of the demo, a guy is practically doing hand stands on the thing and trying to tip it over, but can barely do it.