Looking for experiences with various theme developers

Hi all,
As great as the WPMU themes are, I need to look outside for this one, and wondering if anyone has experience with
GoodLayers: http://themeforest.net/item/architecture-premium-wordpress-theme/3580702

Support and documentation are the reason I'm a member here, and there's some scary stuff out there. Appreciate any advice or suggestions for alternatives. Thanks!