I wore the Henderson polyolefin for a couple years and then started buying the Lavacore products and never looked back. The poly just sits in the locker though it is better than nothing. It is a good undergarment and nice and loose. It does provide some warmth, is neutrally buoyant,fast drying and when wet clings to you like a second skin so you might as well be naked when changing in public.
The problem with a frontzip is it's hard to get off by yourself. I have the Lavacore full suit but again it's a frontzip. I wear the separate pants and long sleeve shirt and have the hood and socks. if you dive a lot in warm water with jellies buy the attached hood. The separate pieces allow you to do the potty thing more easily [important when you get older.] Lavacore costs more but I think is worth it. It goes on a little snug but if you put it on early it stretches out comfortably and is not even noticeable by the time you go to suit up. In the winter I wear it as one of the layers under the drysuit in case of a partial flood. It does dry slowly so this could be an issue in the tropics. Be sure to dry it inside out since the outer layer is wind resistant and slightly water resistant so it tends to keep the water in the fleece, inside. It does stick to the bare skin when wet at which time it peels off easy but goes on hard. Wear a lycra skin under it if this is an issue.
The polyolefin is a step above a lycra skin: The Lavacore is a step above the polyolefin and is starting to cross the line into the wetsuit category. I love the Lavacore though I agree with others that there may be an issue with threads unravelling in places. If you can afford it buy the whole line so you can mix and match. As I said before, it works under the drysuit also. As far as looks goes when changing topside, the Lavacore has the look of a wetsuit, the polyolefin looks more like wet underwear.