I have been using HTFSE to test flavor, vaporization, and ease of q tipping with the 30 mm obsidian. 540-580 has intense flavor and takes three hits to clear a .1. There is not problem cleaning, and your wax turns a golden brown to dark brown. At 580-610 it takes 2 hits, and your cue tips are now chocolate brown to black at the tip, some burnt tastes at the end of the hit may be present. At 610-650 you vaporize a .1 in one strong hit with a wispy trailer. It can taste burnt at the end, and the taste becomes less nuanced. Cleaning is difficult and you might not get all the oil off, forcing you to drop to 275 and get out the DI water. I have been camping at 640 due to the intensity of the cloud, finding the flavor to be acceptable even compared to the 540 hit. All of this is with a High 5 box with maybe a 40 degree delta.