I currently really own one flipper, a ZT 0562. I love it, and I love the flipper. However, when searching for future purchases, few of the knives I look at have flippers. Not anything against them, the knives I like just generally don't have them. I have never really found a disadvantage or an advantage of a flipper in practical use. As stated above, theoretically it could get in the way, or save your fingers in a thrust, but I have never experienced either of these things personally. A flipper, especially a good flipper, is a lot of fun and I can appreciate it from an engineering perspective. I think every knife fan should give a decent flipper, like a ZT, a try. I have handled knives that do not flip very well and they kind of kill it for me. The Benchmade 300 Flipper is a good example. Great knife, horrid flipper. I think if you find a flipper model you like otherwise, and meets your other criteria for a knife, give it a go!