A lot of people use flick tips on whips, where the small fish targeted and more supple action of a whip work out well, I very rarely see anything but elastic on poles, for the obvious reason that stiff long poles, light lines, flick tips and big fish, or even medium size fish, don't mix well.
There's a video of a famous match angler, Dennis White, fishing a deep river and catching good roach on a flick tip pole. He says he prefers the feel to playing his fish on elastic, which I get. In another vid, an angler catches some decent perch from a deep reservoir on a flick tip pole - he says it sets the hook at depth better. Both benefit from having a long line under the float, so more stretch.
I don't use a flick tip on a long pole, but, despite everyone telling me you have to cut the tip right back for elastic to work, I do, for small fish on canals etc, put a very light elastic, say no, 3, through the very thin hollow tip section most chop back or throw away. I find that set up works great for roach and bream up to a couple of pounds.
Where are you fishing with your flick tip pole, what are you catching and what line are you using?