Yes - we've done them on both our previous trips - and will probably go again on the next trip - if we have time.
They have 2 sites. I believe (although I may be wrong) that the East Lake Fish Camp one is supposed to be the better one - that's the one we've used.
My tips are:
Avoid weekend - as there are lots of people out on their boats then and they disturb the wildlife
Go on the first ride of the day (if poss) - then the wildlife may not have been scared off
Wear sunscreen (lots) - you can easily get burnt
Try the restaurant for breakfast - nice egg&bacon sandwiches - v cheap - and quite an interesting experience - lots of characters about (and I don't mean Disney ones!)
A big thumbs up from me - we had a fantastic morning at the east lake fish camp and the airboat ride is a real experience.
As Julie says - for the best chance of catching sight of aligators make sure you go early morning for the first boat of the day - the gators do not like the mid-day heat and will head deep into the marsh for shade !
Check them out at Boggy Creek Airboats - make sure you print out the discount coupon !