We've been long-time Optimizely users and like it well enough, but they're moving to Optimizely X exclusively which quadruples our monthly price.
I used VWO on a project recently and actually liked the interface a bit more than Optimizely. It's also a fraction of the cost.
From VWO's marketing materials, it looks like you can accomplish pretty much everything you can with Optimizely... At the end of the day, as long as I can inject JS/CSS changes, setup A/B/n and MVT tests, and analyze the results, I'd be happy.
Anyone have experience with the true differences between the platforms? Am I REALLY missing out on much by making the switch to VWO? Our product is B2C - definitely not an enterprise application.