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I use them on every dive. If it's warmer water and I don't wear my drygloves, they are my wetgloves. I have had them down to 42 degrees and been fine. I do recommend buying 2 pair. Somehow you will always get the first pair wet. Whether it's sweat, bad job seating your drygloves, water on them taking off drygloves(after the dive), or whatever. There has been a lot of times I had to loan them out as someone forgot theirs. I would go with 2 pair, and swap them after each dive That way, you are won't have a wet or damp dryglove on the second dive which will keep your hands warmer. While you're on dive 2, let the first pair dry in the sun and they are ready for dive 3 and so on.
I used to get cold wearing these in about 45 degree water. I have put on a little baby weight after our daughter which probably helped, but I also use their Wrist warmer with them now....Most comfortable my hands have ever been with the combo.