If I were to buy a pulse detector, and bearing in mind I do not go diving, my choices would be:
1. Sand Shark
2. Detectorpro Pulse
3. Dual Field
4. Garrett Sea Hunter
I have used them all. I like the Sand Shark due to its ease of use, its lifetime warranty (who ever heard of that in a beach detector?) and the exterior volume control (a BIG plus). I like the DP Pulse due to its light weight, exterior volume control, and sensitivity, especially to smaller gold.
Downside to the Sand Shark for me is the weight, the downside to the DP Pulse is that it sucks the batteries dry in no time (about 8 hours) and it could be constructed better, IMHO. But if you are reasonably careful about handling your equipment, you should be fine.
The Dual Field? It's a White's and they build quality equipment. But for me that 12" coil was just too unmanageable and wanted to float so darn badly, though there appears to be an after-market coil weight for it now. Now I know some folks who use it and love it, so it really just a matter of personal preferences. And everybody is different.