In comparison to Beauty Bio, this is very similar (and much less expensive). So, I really like the cap here! The Beauty Bio cap snaps on (and it has to be precise). Here, the cap slides on. It really like that! (And, yes, the cap is super important because you are dealing with microneedles).Like Beauty Bio, the roller moves very smoothly. This roller is a little wider than a standard Beauty Bio roller: which means that this takes less time to achieve optimal results. Likewise, the microneedles hSee full review