I like my Oz Armour (three layer) suit too. On hot days I can sometimes still get a bit sweaty, but I'd probably do that without the suit too (possibly more so if I was opening up hives at the time
It was recommended to me by the son of a friend. He'd spent a (UK) winter out in New Zealand working in a commercial beekeeping operation and apparently used to work quite regularly with just a pair of shorts on under the suit because the weather was so warm.
No idea how it compares to other ventilated suits as it's my first. It does feel quite heavy when picked up, but I've never noticed the weight when wearing it. The one disadvantage, perhaps with all similar designs of ventilated suit, is that they don't really seem to lend themselves to "tailoring". I have to buy a fairly large size as I'm very broad across the shoulders -- I have a 50" chest which means the 3XL is just large enough to be comfortable, but my 36" waist and 5'10" height means there's a lot of material in the rest of the suit that I could happily live without. Sadly removing it doesn't look very easy to do compared with simpler designs of suit.
James