When my old, loved Seaskin started to leak left, right and centre, I thought I would pay (quite) a bit more and get something that would last me. Went for an O3. The ordering service was brilliant. After filling in my measurements, they sent me 2 suits and got me to send them photos of me standing in different poses in each. Then from those they made me mine. Very professional service in every way. Emails from them to say when it was being made, and then posted etc etc.
And it's beautifully made, fits well and obviously hard wearing..... But....
As well as diving, I use the suit on my rib because it's on a mooring and I fin out to it. The suit is certainly heavyweight. I was finding that after a couple of hours on the boat, with the 200 metre walk there and back plus the fin out and back I was feeling knackered. Couldn't understand why. And a bit of an effort getting it on and off. And one day I put on my old Seaskin and went out on the boat. It was like wearing a onesie (no, I have never worn a onesie). Movement became so easy again. I didn't feel like Maggie Simpson dressed to go out in the snow.
I feel embarrassed to say, I straight away ordered a new Seaskin and I now use that most of the time. At a bit more than half the price (as it was then, don't know about now). The 03 comes out if I'm on a liveaboard for a week, because, well, it needs using; but if there's any walking about to be done, Seaskin every time. I know it will eventually deteriorate, but, to me, that's worth it for the comfort.