Here's a screenshot of a fresh Magento Enterprise 1.12 installation. It's paying a tribute to one of it's founders... ;)
I swear no Photoshop, just 5 minutes of refreshing ;). By the way, I'm working on a complete review of all Magento Enterprise 1.12 features (the above CAPTCHA is one of them), so stay tuned for that :).
Recently I've seen some (often absolute) statements going around, generally in the line of "open source commerce platforms are a terrible idea". Now of course different solutions always have different pros and cons.
A hierarchy of evidence (or levels of evidence) is a heuristic used to rank the relative strength of results obtained from scientific research. I've created a version of this chart/pyramid applied to CRO which you can see below. It contains the options we have as optimizers and tools and methods we often use to gather data.