I love WooThemes because they produce consistently high-quality themes that get the job done. The theme option interface is second to none, and the code is extremely neat, something which is unfortunately NOT currently standard amongst theme developers.
The talented designers at WooThemes consistently create some of the best WordPress themes I’ve seen anywhere. We often use them as frameworks for our own clients’ sites, dramatically reducing both development costs and turnaround time. Thank you, WooThemes!