Hey Paul,
I have the Whites Bulls eye, a kelly-co Automax, a sun ray. I like them all, I also swap out the stock coil (at the machine, on the fly) with a small coil for a 'smart' pinpointer. I hold the coil in my hand and keep it in the pouch when not in use. Deep large targets are located best in the hole with a small coil-but you don't have to go to the trouble of mounting it! For shallow/near proximity/handheld depth, I like the Automax best- it has a long probe and I find it most sensitive. The sunray works great but adds weight to the unit- three inches is not impressive for depth on small targets. The bulls-eye is small, pocketable and has a light. My choice in order of pref:
*Buy a small coil for the potholes/anywhere/anytime.Make it a probe!
*Get an Automax for all-around perfomance.
*Bulls-eye for smallest carry-along.
*Sun ray for,...short sessions :Note, there is a failure at the entrance to the probe that develops after a while and it will false. Then you will have to contact the MFGr, and that is not sun ray!
I modified the automax-shortened the handle to balance against my palm while adjusting sens. This is a one-handed operation and is fast-you will make changes to sens often for best performance. A small factory coil will be the most sensative, best depth, smart 'probe'you can get. Or, you can do what i did and buy them all! hihi!
Cheers.