What's the catch with the U of Alabama scholarship?

We are from OOS and looked at UA for our first child. We did not visit as it seemed so far away (12 hours) and my son was able to get a full-tuition scholarship at a similar school closer to home. I kept reading the UA forum so when son #2 wanted to got to a school in a warmer climate, I sent my husband and son down for a visit. They came back sold. Son#2 will be graduating this school year with a double major, and a masters degree. Son #3 looked at several schools, but really wanted to go to UA. He is a rising sophomore there now. Honestly the NMF award and Presidential scholarship is the reason we checked the school out. However, we have been very happy with the quality of the school and the many programs they offer. I have recommended UA to many students I have talked to, and plan to continue doing so.