Hiya.
Most important thing about a dry suit (having seen rather a lot pass through the various Twin F, Adv. Nitrox, DIR F etc. courses I've been on) is fit.
The second most important thing is fit.
The third most important thing is fit.
Am I getting through here?
There's really no such thing as a 'tech suit'. Front entry suits are seen as preferable as you are not fighting against a heavy duty zip when you want to move your shoulders to get at your valves. Telescopic suits also help you reach as they give you a bit more movement.
However, I've seen divers in rear entry, neoprene suits perform flawless shutdowns - without any of the floaty feet syndrome that others get in neoprene boots. As long as it fits well - allowing for a full range of movement.
My own experience:
I had a Hunter suit - well two acually as the build quality on the first was not great. They are tough suits - similar to the Otters. They do not come made to measure so if you don't fit a stock size perfectly - don't buy one.
DUI TLS 350 - my original DUI suit is a Quick Zip which is a pain in the arse as it does up right under your harness. Having said that, after the Hunter it was delightfully light to wear, quick drying and It was a stock size and whilst it technically 'fits' it does not fit me as well as I would like as I can feel the suit pulling against me slightly when I shut posts down. My other TLS is just wonderful - but that is because it fits me properly. Made to Measure done by Andy at Hydrotech.
Otter appear to be good suits when they fit (which unfortunately seems to be rare). The build quality though is excellent although as mentioned above they do seem to like the front pocket option - which I'm sure stems back from commerical diving links.
O3 suits are clearly warm - but some people have had problems with the extra heavy duty zips that they put in them - almost giving divers a coat hanger effect. The boots are huge too - and you would almost certainly have to change your fins as the same time.
I'm quite impressed with the Protec suits - they are certainly getting a good name for customer service and they appear prepared to take the time and effort to get a good fit on a made to measure suit. The business is for sale though so we don't know what will happen there.
Polar bears - well they have produced the least fitting suits I have ever seen - but there does not appear to be anything inheritantly worng with the actual suit - if you can get one which fits. They are a damn site closer to you than protec for the fitting sessions though.
HTH
