The big issue with systemics like the Bayer 3-in-1 is that the insects develop immunity to it very quickly - on my plants it took less than a year. My neighbor (who has a Masters in Hort and worked for the state as a pesticide inspector) says that the home made "mechanical" remedies like soap and oil sprays are much more effective in the long run.
A systemic that is in a plant for a while eventually kills off most of the bugs, so you think you have a good result. What you don't realize is that there were survivors, and once they breed, their offspring will be resistant to the stuff you use. So the next time you put it on - Pffft! Nothing happens!
For spider mites or aphids, just a regular spray of plain water works very well. If you can put your plant in the kitchen sink or in your shower and just spray it down, the plant will love it, and the mites will be washed away. You need to do this maybe every 2nd week or so in warm weather.
Otherwise I like soapy water spray, just 1/2 tsp of dish soap to a quart of water works as well as fancy, expensive insecticidal soap. Cost is a fraction, as well.
