My wife taught for a few weeks at Doha Dolphins and ended up walking away from it. There was a very standard structure for all students within any given bracket, regardless of individual skill. (think of "one size fits all") Basically had some kids using floatation aids who clearly didnt need to and whatnot. Forcing a kid to keep on one of those type devices certainly would hold anyone back from significant progress.

Needless to say she ended up teaching her own lessons at our compound with a handful of parents withdrawling from the Dolphins program and choosing private instruction with her.

No experience with H2O, so no comment.