I had them check airfare for me a couple weeks ago. Their price was no different that what I was able to find on my own. I didn't end up going with them. I was waiting for SW prices to come out. Booked my own.
I did book through them my airfare for this August. Not sure how to do the whole Southwest seating "stuff". Went with US Air they gave me the same prices that I found on US Airs website. Member Services was more helpful than the TA I have used with AAA.