Have tried them all, but Thingamabobbers are still the best on the market. Not sure why there are so many complaints about kinked leaders. You folks aren't using expensive tapered leaders for nymphing, are you? I use them almost exclusively and a leader might have to be changed after a couple of days of fishing, but they are mostly just straight leader material so not really much of an issue. For light presentations, shallow drops, and very small leaders, Palsas work best for me.

Those Airlock variants look interesting but will be heavier than a Thingamabobber, and those wrap around screw-type of indicators still kink the leader if that is your worry. There is newish indicator on the market that has a similar set-up called the "Screw Ball Indicator" which is nice on small tippets, and easily adjustable. They are a bit heavy, though, and I'm still not sure I like them any better than a Thingamabobber.