My experience with the needle valve is that it's very sensitive, meaning the slightest adjustment effects the bubble count a bit more than I would like. I have no other experience with any other needle valves though. That being said, as long as I have a steady hand and make tiny adjustments I can dial it in fairly easy. Also, the needle doesn't float and holds the bubble count consistently. My only gripes with it would be the solenoid and the diffuser. The solenoid takes a bit of time after turning off (15-20mins) to completely stop all bubbles, again I have no experience with any others so this may just be how solenoids work? The diffuser works completely fine, just makes a lot of micro bubbles likes it's supposed to haha just I think I may have preferred not seeing them but that's not something that effects the function at all.
On a side note, on co2art there should be a currency converter, on my phone it's at the top under currency. Also they provide a 5 year warranty on the system I linked which is pretty awesome if you ask me!
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