I just received a 850D from Nathan and the universe provided me with an opportunity to use it the day it arrived
Without hardly reading the instructions I was able to remove two SOT-23 transistors from 10 boards in about as many minutes, awesome! (they were suposed to be SOT-23 diodes
Adhoc procedure for correcting my mistake:
1. Set temp to about 350C (or midway on temp knob)
2. Set air flow to near minimum (don't want to blow away small parts)
3. Put on small tube nozzle
4. Hold 1" above part and preheat about 5 seconds
5. Lower nozzle to about 1/8" above part and watch the solder melt on all pins at the same time in a few seconds.
6. Quickly grab part with metal tweezers and remove
7. Clean up excess solder from pads with solder wick and soldering iron
8. Add fresh solder paste
9. Place proper components
10. Preheat 5 seconds at 1"
11. Reflow at 1/8"
12. Clean off flux (I use water soluable paste and the flux is corrosive)
12. Inspect (looked as good as new)
This thing is also a mad heat shrink tubing gun. Set temp at min setting (160C) and air flow at 1/2 setting and you can shrink the tubing without worring about overheating it using the same small nozzle.
Even though I bought the expensive one, it was worth the price of admission just to watch the solder melt on all pins at te same time.