We have a STS 16 and a STS 14.  I only drive the 16.  both have 120 booms. 

I really like the front boom after haveing it.  I see no problems with drift on the sprayer, but I will wait til later this summer and see as we have had the booms really close to the ground so far this spring.  see how it is in bug spraying in beans.  have had a couple small problems with the 16 but service has been pretty good.   Must have a 100 hours on both by now.

we had mid 90's rogators and gallenburg eagles before these.  I have a 16 row side dress bar for the 16 as well.