The biggest draw back I see is that if you go that way, you can not participate in most competitions or fun flys around the country. AMA is a big enough monopoly that they can dictate manditory participation in any contest that is sanctioned by them. This means a UMA insured cannot fly in an AMA contest. Most of the contests and flying fields are going to be AMA sanctioned at this point. If you don't care about flying anywhere else, UMA wouldn't be bad. I think you will find that a lot of people like to compete or visit other fields and would not look positivly at it for that reason. Just my 2 cents.