Hi FLONI -- I like your posts. Thanks for the questions. Here are my answers:
200 mph? I don't know if my blower really puts out air at 200 mph. I can attest that it comes out real fast. It has two speed settings. The lower one, less than the claimed 200 mph setting, does not do a good job. My experience -- that a 200+ mph blower is advisable -- matches that of other blower-users whose posts I have read.
I have not noticed any negative effects from using the blower. Now, if there is any dirt or dust clouds in the air, I would never use the blower. But, I would not wash the car under those conditions, either.
As to the CWB, I know that some people have had positive experiences. I read the posts before I got my blade. I saw that the opinions were mixed. I read the advice about making sure that the blade was clean and followed it. I had great results at the beginning. Then, one day I noticed marring in the Zaino. Scared me big time . . . what if it went deeper? The marring was not the result of a dirt particle on the CWB, rather, I believe, the "chatter" of the CWB accross the paint. I have used it once, since, with trepidation, but only because I did not have my blower. The blower is quick, through, gets water out of crannies, and does not abraid the paint, in my experience.