Flaxbeard has a jetpack mod for it's exosuit, it does eat up all your steam though. The jump mod and glider mod are much better for long distance travel.
I kinda think flight is too convenient. It's handy for building to hover though but it still cheapens survival building. I tend to get flight later then I can.
Part of the problem is that the jetpack or other flight become the default mode of movement. They're all too powerful. Or you can recharge them on the fly. I like Mekanism, because it's jetpack needs hydrogen generated by a fixed, power using structure. You can't recharge it in flight, or even just in the inventory. You have to haul around a gas tank and place it to recharge the jetpack.