Optimizely - A/B testing you'll actually use

Optimizely recently released iOS support, which has always been tricky to do on mobile. Do you use this at Mashable, @petecashmore? If so, can you share any results?

Love this product, even a novice can pick this up very easily. Super user friendly and the gains you can get from A/B testing is tremendous using Optimizely.

Every since they have adopted the Freemium model, they have become an indispensable tool.. Works great.