I have had mine for about 3 weeks and love
it. I got it on one of Morebeer's deals of the day and could not be happier. Admittedly, I only use it for cleaning & sanatizing kegs and better bottles, but I am absolutely in love with this thing. No more soaking and doing the wash cloth trick on my grimy BBs, no more letting my kegs soak with 5 gallons of PBW in them. I've always been careful about getting the collar seated as indicated by the instructions above and have never had a problem. I've probably cleaned about 10 Kegs and a half a dozen better bottles.
Only using a gallon of water for cleaning and another for sanitizing makes this an absolute win in my book. I don't use glass carboys, so I cannot speak to the issues some of you have expressed, but for what I use it for, I couldn't be happier.
BTW, Mark, I see you are over in Tigard. Glad to support a local business. Cheers from PDX, and thanks for what IMO is a great product.
Here are pics of mine in action.