Roor is a piece, PHX is a bigger piece, Jerome you are paying for the name. If you can find them Darby bongs are the shit! The best quality construction bong i have ever seen, owned, ripped, etc. the joint is as thick as the rest of the bong, the downstem is worked and diffused. The bowl is worked too but i think the hole is just a little too big and i ended swapping it out, and now i have a back up when somebody breaks it in the middle of smoking. If this bong was a roor or phx it would have been broken by now, because i had both and somebody (not me, i have never broken my own bong) has broken them by the stupidist way ever. Darby is just like i like my ladies thick from top to bottom. lol