Of course choice of glass is very subjective, very personal. You'll get a very wide range of responses here. That said, note that the Calyx uses a circ percolator. I haven't personally used this piece, but as a general rule circ's are kinda chuggy compared to other percs. My first HT was a circ (the original Cloud style, but essentially same perc). I sold it. AFAICT the only advantages of the calyx, besides price, are its size and different mouthpiece (assuming you prefer that style). The turbine should be smoother and quieter; my turbine (same perc, diff piece) sort of swirls the water, there isn't a lot of action or much diffusion. You didn't ask about a favorite, but fwiw mine would be the bomb. I have several pieces that use that style of perc (invented by Mobius IIRC), and the action is fantastic with excellent diffusion yet the flow is still very smooth.