Have you tried out the multivariate experiment type in Optimizer? Unlike the "classic" A/B test, there's effectively no risk of exposing the fact that someone i

Have you tried out the multivariate experiment type in Optimizer? Unlike the "classic" A/B test, there's effectively no risk of exposing the fact that someone is part of an experimental group to normal users. (Of course, HN types could still pick out the telltale JS fragments in the page source, but that's a risk with any testing that has a client-side component.) We've been pretty happy with GWO's combination of being a) free, b) easy for marketing+management types to use for reporting, and c) integrated with our Analytics and AdWords accounts. Just out of curiosity, though: are there competitive hosted solutions you would recommend over GWO? More options would be a good thing to know about...