I just bought my first M8. In fact, its my first "real" digital camera. (Until now M2/G1/FE film).
While the 8 isn't nearly as quiet as the 9 or my old M2, it certainly isn't as noisy as my old FE+MD12 or F3+MD4. In discreet mode I would say its quiet enough for the $1000 savings over an 8.2 or $4000 savings over a 9. Unless there is some other super-special reason to get a new shutter, I would be awfully hard pressed to justify a shutter upgrade.
I would like the sapphire glass, but here again, for $1300 I can buy 200+ lifetime supplies of LCD screen protectors. Again - very tough to justify.
Jury is still out on the rangefinder. I can already see that upgrade might be frustrating, but I can get a CV 50/1.1 for <$1100 and learn to live with some framing issues.
Vulcanite vs leatherette? Sorry, can't get too worked up about that one. The 8.2 black-dot I would like, but a piece of black tape or Sharpie is next to free. As for the finish, I see the black chrome as a major advantage of the 8 as a user camera. While the paint on the 8.2 and 9 are lovely, my camera would be brassy within the first year.
Frankly $1100-$2200 seems pretty steep for what really are marginal upgrades. Heck, for $2500 I can just buy another used M8.
So far I really like the 8. I was really worried about the 1.33 crop factor, but after trading for a 28 elmarit I'm totally fine with it. Ok, its not as wide as I would like, but it also helps me justify finally buying the CV15 I've been wanting for so long. Seems like a fair trade.
While I do see it has some limitations to the 8 (especially if I had paid full new price) overall its a pretty decent camera. In a couple of months maybe I'll have a different opinion, but for now I'm more pleased than I thought I would be.
In short, I don't see any major down-sides to buying an M8. Especially as a first foray into "real" Leica digital, it sure beat sitting on the sidelines for another 2 years until 9 prices descend from the stratosphere.
I too would be pretty upset if I had paid $4k for it new with all these little issues. But for $2-2.5k its a pretty good deal and one heck of a user camera.