From Dan at North....
As far as the bladders delaming... This was an issue for some people in hot areas in '09 (we didn't run into a whole lot in mainland USA), but we have a different source for bladders and completely different valves for 2011 so we hope to see these issues disappear. I'd like to guarantee they'll last forever, but only time will tell. If it helps, I haven't heard of any delams at this point, but it's only been 6 months.
Dan, that is great news! Down in PR, many of us have had chronic valve delams for years. Generally our experience has been that the valves do not delam until after the first season. Therefore they have never presented a warranty issue for North. I personally know guys that have moved from North to other brands due to North's apparent unwillingness to address or at times even acknowledge the issue. So this is big news for us!
Was the change in bladders more of a supplier issue or was it an attempt to address the problem? Have the adhesives been changed? Are the bladders lighter?
I found it curious that a North valve could be removed simply by putting the valve in very hot water, where as the replacement Airtime valves wont come off no matter what you do.