I own a few slurpers, there are some oddities with the sizing, barrel is restricted to only allow 5mm-5.5mm (I believe it is bottlenecked to 5-5.5mm, previous CF slurper did not restrict the barrel opening) width pearls/pillars. This restricts set-up possibilities, and if two pearls are inserted they fit so snugly that its tough to get them to move at all. Besides the strange sizing choices, its a tad crooked but functions very well with one 5mm pearl or with a pillar. I do not regret buying it ...