What does the software or service do well? Optimizely is the gold standard in A/B testing solutions. Users can set up all kinds of multi-variant testing, split traffic, make quick landing page edits, and monitor results all within a single platform.
What does the software or service not do well? The tool is meant for advanced users, those that are new to A/B testing or those that are unfamiliar with how to post pixels on landing pages or in GTM will need the assistance of a developer or an advanced user.
What do you wish you had known about the software or service before using? The pricing tiers increase the higher the traffic volume, also you may incur overage charges if you go over your allotted traffic usage.
Have you used a competitor to the software or service? If so, how does it compare? There are other options from Adobe and Google but neither are as sophisticated or feature rich.