i spoke to their tech support guy last week for a good while, and he was very informed and helpful. he recommended, in the case of a roaster (mine a UG-15), to find a run ideally 6 or 8 feet (horizontal or vertical, presumably preferably vertical?), because temp is critical as you say. he recommended using metal tubing for the run from the pitot tube to the readout, thereby acting as a heat sink to lower the temp. their site is pretty useful [don't waste your time on the product selector, they admit it sucks] - i would be interested in which part numbers you choose to install. i have been playing with adjusting the airflow vent (by intuition and feel) at different times during each cycle (with good results), and i suspect the magnehelics will give me better understanding of measurable increases/decreases in flow when i make certain adjustments. exciting stuff.
... but how does it taste?