I sold a bike once, 50cc with a 15 bing. It came back to me, still 50cc with a nice proper VM20 and intake all done up. It was almost $150 and it was distinctly worse with the VM20 just cuz it didnt really pull enough to be useful. you gotta really scream in the RPMs to need a carb that big on a 50
sha is easy, and sure it's less tunable, but that means it is easier to get to "good enough" with less tuning required...