I like it because you can test several variations of CTAs, which makes testing different layouts/conversions really easy. There are also several other tools for A/B tests and this one lets you do those too. It's very simple software with limited options. If you're looking for something fast and cheap solution to start your experiment, then go ahead! Try it out first if possible. Testing multiple designs in only few minutes so far has been great experience. We can see what works best and improve our product without needing many resources or more time - just some clicks.