We retained Tracy to completely redesign our website (Rapportive - relaunch imminent, what's online is still the old site at time of writing). Her design is beautiful, daring, and effective. She's gone above and beyond in responding to our myriad tweaks and requests, given us great feedback, and been fun to hang out with along the way.
Tracy worked with us on http://getupandmove.me/ and handled our really tough design direction and came out with great creative solutions like a champ. More importantly, she delivered reliably and quickly, unlike many who talk and talk but never do. I would definitely bet on her.
I bet she would make a great cofounder.