We were using Optimizely until we didn't qualify for the lowest tier paid plan. Not enough impressions?

We knew at our traffic tier, Optimizely experiment analysis was not going to be statically robust. We were going to have our data person do the analysis with different techniques to deal with the smaller sample size. What we really wanted was the interface for a non-technical person to create the variation and Optimizely to manage which variation people saw.

Instead of letting us continue, our account was canceled. In the next months, when we do have the traffic, we are not going to consider them. Not impressed.