You asked if anyone had experience with generics and I have, so calm down!
I do not work for Bayer though I did work for Syngenta after college. I do however maintain Strong ties to my reps from Bayer, Syngenta and Dow.
Fyi, large tree care is fairly new to us since we are primarily a lawn and ornamental company. I came here to learn from more experienced people like yourself but this was the first subject that I thought my imput could be helpful to someone else! As a small businessman I have to evaluate cost on every treatment going out the door, We do use generics in alot of situations in the turf side and I do feel they have a place in our arsenal of products.
However, When syngenta rolled out their liquid formulation of barricade 3 years ago we had a major problem as did several friends in the state using the same product. I had the syngenta rep out, he sent technical people and they not only covered the cost to fix the issue, but they took responsibility. Fortunately, I haven't had any large issues with Bayer but, they did cover the cost to respray some fields with revolver when technically it was the weather not the product causing the issue. I have had a problem with trimec 992 not killing clover and they responded as well! As far as generics go I have seen some major differences in formulations such as daconil and Banner. The first time we tried generic banner it left a oily film in our tank! I have a close friend who used the qualipro prodiamine product and had major breakdown this year. He has yet to hear from someone who can deal with it properly! My point with generics is as with new formulations from the big boys is they need years of testing before I am willing to use them for a treatment that makes up a substantial part of my revenue and as in the case of Barricade 4l it was the carrier not the ai that caused the problems! I just don't understand why you would use a generic if the Basic would match the price and stand behind the product.
I have seen test results that show difference in results between barricade and the generics, While not a huge difference this was in university trials which in my experience will raise significantly in the real world.