I used to use Bayer 3 in 1, and I do have to say, no pests, very little blackspot, however, I had hardly any worms in the soil and the few that were there were weak and off colored.
A few years now of not using any chemicals, huge numbers of worms, but tons of aphids. I ordered some live ladybugs, and wow!
Two days later, and all the aphids are gone, most of the ladybugs have flown but about 20 seem to have stayed possibly laying eggs. My neighbors have commented that THEIR roses have no aphids now too. Defilntly will be doing this again next year.