Thought I'd share my experience with some suits some of you might be considering.
Disclaimer: I haven't worn any of these in the water yet. I live in San Diego where the water has been in the high 50's lower 60's in November. I'm 5'10 175 lbs.
Tried the Isurus 3.3 Zipfree in two sizes LS and MT , Feral 4/3 Chest Zip LS, and Rip Curl 4/3 Flashbomb E6 Zipfree without smoothie LS.
Isurus: This is hands down the best feeling wetsuit. Easy on, easy off. Extremely flexible. Neoprene feels like excellent quality. The problem is the sizing for me. According to the size guide, I should be LS. I ordered LS but it feels a bit loose in the neck. Feels great everywhere else. But could be a bit tighter. I worry that in the water this will be a problem. Isurus suggested they send me size MT and I agreed. This one feels tighter but too long. At 5'10", I'm at the bottom of the height range according to the chart. There's a bit of excess material in the torso and behind the knees. I don't like it. I think the perfect size would be the Medium but they are sold out until March/April. Still considering keeping the LS because it feels so good. I'm just worried about flushing with the neck not being as tight as the other suits. Also, because it feels so thin, I'm concerned this will not be warm enough for the coldest days. But many people in the forum have commented that it's plenty warm. I think the compression design must work quite well. The bungee pull on the chest to tighten the upper is not as good as Rip Curl. The suit bunches up around the bungee when it's tightened. The Rip Curl doesn't do that. And the bungee loses some tension when you let it go. Probably a non-issue but I hope they take a look at Rip Curl's suits and improve that part of the suit since their zip free suits are going to be huge sellers.
Feral: Size LS fits great. Hands down the most luxurious, best quality of the suits I tried. I think it's a step above Isurus in craftsmanship and quality. Feels really good on the skin. Also, I think this would easily be the warmest of the suits. But it's pretty restrictive in the shoulders/traps. I know this will get better with use but when the others are so much more flexible right off the bat, it's hard to choose this one. After years in a Patagonia R1, I want better flexibility. I'd choose it if I were surfing somewhere colder than San Diego. Also I like the styling much better than Isurus and RC. Simple and not highly visible logos.
Rip Curl: Size LS fits perfectly. So so flexible. The flash lining is a little itchy but I don't expect I'll feel that in the water. Love how easily it goes on and comes off. Quality of the neoprene looks like sh!t compared to the Yamamoto suits. But ultimately I think I'm choosing this one because it's flexible and fits well. Also of note is the zip free closure mechanism is superior to the one on the Isurus.
In the end, I wish Isurus had a medium in stock. And I will get a 2.2 zip free when the time comes. But for now, the water is pretty chilly and my leaking, very, very old Patagonia 3 mil isn't cutting it.