Anybody on here have a Spray-Air sprayer with the dial-a-drop nozzles?  I'm looking at an older one that does have the newer style nozzles on it and am wondering how well they work on pre-emerge spraying.  I can see how they would be really nice for post emerge work, but wonder if the fan will stir up too much dust when applying pre-emerge chemicals.  Also, how do the booms hold up and do they have much suspension to them?  It's a late '90s sprayer, and there just aren't many of these down in this part of the country.

Thanks for any help you can offer,

Mike