This is an interesting topic. I didn't mind Grey Flannel's opening, but after 15 minutes (or whatever it was) it went into a crude, putrid/acrid sandalwood type of thing (that I hate). On the other hand, I usually try to knock out most of the openings (of all of my frags) now by inhaling deeply, spraying, then blowing on my chest to dry it quickly while walking into another room before inhaling again. This allows me to appreciate the middle and base notes. I have big problems with my appreciation of the frag getting calibrated to the opening, and I find that I can spray just once or twice and appreciate it for hours if I use my technique (and also others around me don't complain that it's too strong).