Just chiming in to say I am a big fan of this theme. I use it as the starting point for every site I do and love its power and flexibility...and how strong it is in the area of optimizations for different platforms. For example, you can have your mobile users see an easier menu treatment with a click of a button, and all that hard work of keeping the site looking good on any viewing platform is done for you.
I can do everything I need to do without ever touching a post or page.php file, or editing a custom css. It has hooks to do all that from within its powerful admin interface.
I add all my CSS customizations to a Custom CSS section, and it saves them in one spot. Then, when they tweak the theme for things like better mobile support (which it is already great at) I can update the theme just like any plug-in, and using the "Weaver II Theme Extra's Plugin" (Wish it was built into the theme, but isn't, so make sure you add this separate plug in too! - thank you Bruce Wampler) you can reapply all your styling, and you are good to go.
The WeaverII subthemes are not very different from eachother, which is disappointing, and might make you underestimate its power. I wish the subthemes would showcase some very different menu options and layouts...but don't be fooled..just create a custom subtheme, and give it a chance. It is fantastic, and I will not be building any more sites without it!