Hi,
I had the Go Find 40. I believe Minelab increased the overall speed of the newer 44 and 66 models. I gave mine to my nephew who hunts when he goes to the beach.
It works well for an occasional use detector. Like many have said, it seems very flimsy and more for the weekend/vacation crowd.
Personally, the detector did not weigh very much BUT it was not well balanced when completely extended for a 6' person, felt very nose heavy and the 40 had slow recovery speed in my opinion.
It reminded me of an X-Terra 305 in a new, lightweight package. It had tones a little bit like the X-Terra series too. My middle school aged nieces and nephews would use it for an hour and move on to something else.
An XP ORX or a Teknetics Minuteman/Eurotek Pro or the Fisher F11, F22, or F44 would be better choices for a lightweight detector using the 8" concentric or the 10X5" DD elliptical coil (harder to find but worth it).
Jeff