Range is nothing, that is based on velocity and paint to bore match
Spoolers are generally quieter and softer on paint, but that all depends on your set up to be honest. The maintenance isnt exactly Harder than other markers, because if your used to it, you can do it just as quick as any other marker, its just they generally require you to open up the top tube thing to get to the bolt assembly.
Spoolers are generally abit more efficient on air (ithink) quieter and softer on paint, but it depends on the one you chose because a Droid for example is WAY more efficient than a shocker, shockers will hog your air in no time atall generally.