The flow is very well built, has good weight and preforms wonderfully! The unit itself has a unique tear drop design that feels great in the hand. The design is minimalist with just one button and a row of five LED's to indicate temperature settings. Design wise the Flow is similar to the Firefly with it's magnetic top plate, chamber position and air path. Unlike the Firefly however, this is a session style vape rather than an on demand one and for a guy like me with a higher tolerance, that's what I prefer! The chamber is quartz lined and heats up in an amazing 40 seconds!