I'm one of those purist that thinks it's only a Martini when it contains gin. However, I'm not a radical about it, to each his own!
I have Hendrick's but usually drink is straight, not as a martini, since it has a distinctive flavor that I don't associate with martinis (but, again, personal preference rules!!). I favor swirling the M & R in the glass, then tossing the excess. I prefer "dirty" martinis over clean, and enjoy a number of different olive garnishes, as the mood strikes.
And I wholeheartedly endorse the recommendation to hold the glass to the sun, make a toast, and enjoy!!!