I thought I'd toss in an observation or two after three months with an Ideal needle valve. All I can say say is why didn't I switch sooner. It has been nothing but consistent. I actually can't remember the last time I had to adjust it. With the Clippard, adjustments were a daily ritual.
One thing I was interested in was how it would behave as the bottle emptied and the pressure began to drop. I should point out that I initially installed the NV on my old Aquariumplants.com reg but soon after I put it on a dual stage Victor so my observation may be due to the regulator, but as the bottle began to empty my bubble count didn't change. It remained as steady as ever.
Another thing I noticed was I apparently had a leak in the Aquariumplants regulator. At the bubble count I'm running I would have gotten 2 months at the most out of a 5lb bottle. I just refilled last week after 3 months. Just an added bonus to an already winning situation.