I've been working with WP for about 3 years, but never built a MU network. The application I have is an eCommerce site we are developing. The client wants a solution where their affiliates can "open" a store that will allow them to upload their logo, choose a background color, but the navigation and pages, as well as store items will be managed by the super admin (me).
We'll start with the main site and 5 satellite sites, but the number of sites will grow - it could easily reach into the many 100's.
Server considerations aside, is MU robust enough to handle this load?
Is MU the right choice to develop around?
What pitfalls would you warn me about?
Thanks for sharing your experience!