Well I've only been to local auctions here in SoCal. Can't speak for any auctions out there in your area because I don't know any in Florida.
If you are really interested though one thing I will recommend is that you only bid on cars locally and/or that you are willing and able to check out before you buy. Seems self explanatory but you'll be surprised how often people bid on cars far away on online auctions like Copart USA because the prices are so low then get burned when they actually win and don't know how they are going to move the car...not to mention repair it. If you use one like that, I would recommend that you only bid on cars you can see before it's sold. They have a pretty decent search engine to help you stick to only cars in a certain area if you like.
Try to get VIN and do the research history too before you buy. Although carfax is popular, I prefer AutoCheck because they give you more info and are a bit more thorough. Either is better than neither...you don't want to find out after you buy that the car was in a head-on collision with used airbags and frame damage in the chassis. It may sound funny but in this market if you don't look at cars first before you buy, you will find that pictures can actually be deceiving...believe-it-or-not. Always wait till you see it and satisfactorily check its condition before you commit to payment. Local auctions are less of a problem in this regard because they tend to have quicker turnover.
Speaking of which, you should be prepared to do some research for local auctions in your area just because that's how you find out which are the best auctions for you. It's best imo, to look locally where your local government and car dealers, insurance companies, car rentals, law enforcement, general services departments, impound yards, etc. get rid of their inventory when they are overstocked. Sometimes they have a local auctioneer handle it which may hold auctions at certain times of the year, month, or even week just depending on how many cars that they consistently need to liquidate and how regular they need to liquidate them.
Keep in mind that there may be some auctions difficult to get a good buy because this is how used car dealers get their stock many times and some auctions may advertise to the public.
The public ones can be the least beneficial unless they have large stock because the bids will usually come in high (especially for popular vehicles) since the buyers are comparing them to market rate, many times they do not check the history or state of the vehicle so they may overestimate the value of the car, and they are not trying to cover a profit margin like the dealers. However this can sometimes still be a good venue if you are looking for an unpopular car.
I think the FiST popularity will depend on the clientele. It is still fairly unpopular except among certain circles so that issue may be sort of be a wildcard. If it's your first auction, try to just sit and watch how it flows and get used to it before you start bidding. Set a limit before the bidding starts and try to stick with it...you don't want to be stuck with a car that you overbidded on either and it's easier than most people think to get caught in the bid flow until the winner becomes the one who realized it and stopped bidding first! Lol.
Happy Bidding and good luck.
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