I'm thinking of joining, too. (Actually, I have been thinking for a long time.) The thing that keeps me from doing it is feeling that I will end up excluding other buying opportunities. On the other hand, considering that I lean more and more toward cask-strength single-barrel bottlings, it seems like a logical thing to do.
While there are lots of bottlings to choose from, I think that if you are very picky about which distilleries you want to buy, you probably won't want to do it. If you are more open-minded and adventurous, and less choosy in that way, your problem will be narrowing your choices down.
The bottling they send you may be something you really want, or not. Another member here, who I expect will reveal himself shortly, got a Glenlivet, which I gather was about the last thing he would have chosen. It turned out to be a real eye-opener for him (and indirectly for me--I never tasted his bottle, but became a big 'Livet fan). Again, you will be better off if you are open-minded about it.
"Good" bottlings? They're all
good bottlings, aren't they?