Original vital injector with suction function

There are many different kinds of vital injector in the market,also different price range.
The original vital injector machine with suction function which made in korea.is that important of the suction ?
Yes, boz mesotherapy gun that have suction function to prevent drug or liquid loss.
Some low price vital injector not have suction,that will be loss many drug.
When you interested purchase it, pls be careful choose the best one.