I've been using the Iron Bay Regulator on a OS 1.60. It had been working for over a month of flying, doing great until the other day, of course about a week before my 1st contest, when my engine quit during a flight and as I was dead-sticking my landing I noticed that fuel was pouring from the front of the plane. The only thing I could think of is that the valve stuck open and I opened the vent line to relieve tank pressure and fuel flow stopped. I have filters for fuel going into tank and in the fuel line but I took it apart anyways to see if it had something in it. Cleaned it up and I put everything back together and it fired up, and seemed to be running strong as usual but again it died during the flight, however this time there was no stream of fuel when I landed. I saw on their website about changing o-rings when opening needle doesn't richen engine much, which I did, but still the same problem. It seems to run great on the bench but as soon as I get in the air it quits. Pattern planes are easy too deadstick at least :-( . Sending it back for now to see it they can advive if there is something wrong with it.
As far as contest went, My buddy and I shared his plane, & I beat him. Hopefully I can beat him with my plane in next contest, LOL.