The most useful feature is the ease of use. The form has to be tailored to the needs of the company. The company I am doing work for has very specific needs, which makes form tabs very useful. The support that is offered is also great. It is difficult to find a downside. I wish there was more of an advanced user's guide. I have used other form tools, but none are as easy to use as form tabs. I am helping a local non-profit find a way to streamline their communication with donors. I like how easy it is use this product with all my companies clients! It's super simple as well very user friendly!! There isn't anything i dislike about using FotM but maybe if you have an issue or question just contact customer service they will help out right away. They do respond fast so don’t worry too much when having questions because their support staff does get them answered quickly. !