A propperly serviced movement
Dont change the date with the hands between 9pm and 3 am as this is when the date change mech is engaged (this is the same for swiss)
Dont hand wind as the week point is the gearing and you stand a chance of snapping teeth off gears (swiss gears are better)
Nothing wrong with using the chrono if it is working, but i would recomend (on asian ones) that if you are timing some thing and you stop the chrono with the second hand at say 40 seconds, then restart it once you have read the time that you want to record, then restart the chrono and let the seconds hand get back to the area of 60 seconds, this has nothing to do with the movement but the quality of the asian hands,
When you reset the chrono a hammer hits a heart shaped cam and the long seconds hand accelerates from where it is to the zero position in about 100th of the second, the tourque that this imparts to the tube where the seconds hand is joined with the movement is the week point and can cause the hand to move on the tube and then it wont reset to zero.
My question is where are you getting the movement from, if it is from China then how will you know it is serviced ect, or is it from your watch maker who will give some sort of guarentee?