I have the seek XR for my iphone. It works GREAT for scanning a field (I use it in conjunction with a photon XT). Sometimes it takes a while to find the critters with the photon, but I know they're out there from the Seek. I have also put a mean stalk on an armadillo or two I mistook for a pig, but you can certainly tell if there is something in a field/brush. Target recognition is almost impossible with it.
Pretty much the same story for me, I use it to see movement and then use the Photon to identify it. It will take a while to get used to using it.