i have a barefoot international drysuit and like it so far. its has all rubber seals and doesn't really leak that much unless i have a hard fall but i am also super skinny. (i will get this kinda of zebra stripes of water on my clothes.) my friend has one too and it only leaks if he falls footing at 40+mph and it hardly leaks like just the ankles and wrists will get damp.
i don't really find it uncomfortable around the neck but if i don't have the seals perfectly laid out at the ankles(like flat). for example if it over laps it will feel uncomfortable after a while. like your leg cramping or losing circulation.
try to get all the air out of it when you get in the water because i heard there is a possiblitly of blowing a seal or zipper.(idk if its true though)
i were two sweats and two long sleeve shirts with life vest underneath, first layer is to absorb the first layer of water that may get through. i also wear a full neopene head garmet for when the water is like 40 degrees. by the end of my run i am pretty heated, but i'd rather be hot than cold any day.
also everything seems a bit more work with the drysuit than wearing a 3/2 suit.( bright side to this is everything seems easier once the suit is off)
can't pee, so make sure you go before you jump in.
have to take care of it. not let it lay in the sun for a long period of time. have to use silicon lubricant on the seals. zipper wax helps zipper slide a bit easier.
here is there website if you want to check it out: http://www.thefootersedge.com/equipment/drysuits.html#
i'm not trying to adverise or anything just kind of hard find there site.
hope some of this helps...