The best thing you can know about a gold pan is how much gold does it lose. I sent my pan to 911Mining, who have no affilliation to me whatsoever. I asked them to do a product review, as well as to send the pan tailings in for an assay of the losses compared to that of a conventional pan. Below is their video, also an interesting one on how gold reacts in a pan full of concentrates.

"SPOILER ALERT" - A conventional pan lost 1.42 grams/ton, Placertools pan lost .01 grams/ton.