Any real carb has vents or "tubes that go no where" and multiple adjustments or 3 screws. Idle , air and fuel.
The stock carb is junk. The CNS is a small improvement. If your looking for quality you want a 18mm Mikuni carb. You can get them on ebay for about the same cost as a CNS.
The Mikuni is not a bolt it on and forget about it carb though. Mounting , jetting and screw adjustments will have to be done.
I havent made the jump to one yet but it is on my radar. I know others around have and could tell you more about the setup and install. I have owned tons of 2 stroke toys though and they all have had Mikuni carbs on them.