I know it's not strictly the same, but I've also just had a very suspect run in with Northern Diver. I bought their Dry Glove System as my scubapro drysuit has neoprene cuffs.... after fitting them 3 times, and each following dive being wet, I decided to call ND for advice.
I was told to send the suit and ring system into them, they'd have a look and let me know what the problem is. A week later i get a call from ND telling me there was nothing wrong with the fitting of the dry rings, but they'd found both my cuffs were leaking and that they'd be able to resolve the issue for me by fitting a nice new pair of cuffs and refix the dry rings, for the princely sum of £130!!!
I explained on the phone that I found that slightly odd, considering the last few dives i'd done using wet gloves as i'd not been able to get the drygloves to remain dry, and had no issues with my cuffs, no leaks, no wet arms etc. That and the fact that once the drygloves are fitted, the cuffs are technically on the inside of what should be a "dry" chamber, inside the gloved area and therefore I think the cuffs are not the problem....
I even suggested that if the cuffs were going to be replaced, perhaps changing the neoprene cuffs to latex would be a good idea, but was told this would not be possible, i forget the reason they gave, but to this day i can't figure why it wouldn't be possible??
I got a whole lot technical babble thrown back at me, that meant nothing, so i asked them to explain in more layman terms about half a dozen times before finally giving in (stupidly) and agreeing to pay the £130 for new neo cuffs and the rings to be refitted. ND promised the suit would come back, guaranteed dry... i figured i just wanted it done, and so paid!
A whole 3 weeks later my suit finally arrived..... i'm yet to have the opportunity to dive the suit and test the result once and for all...... but however i look at it, £130 big ones for essentially a new pair of cuffs that i'm not even convinced i needed (the suit was only about 8 months old, and i'd had no problems with seal leakage when diving wet gloves!) leaves a bitter taste..... not impressed at all. Needless to say i won't be purchasing anything ND in the future!!! Their customer service is a far cry from satisfactory... Just my opinion, based on my own experience!