Actually, not to correct ( o ) ( o ) but just to be a bit more specific. Good stacking occurs, when you can actually watch the level of the bubbles increase, as a base builds beneath the previous level of bubbles. DG pieces illustrate this pretty well, though some might call that more of a "froth". It still amazing stacking. Though I prefer a well made inline, showerhead or tree (which I think have the least margin for error). Stacking isn't that big a deal to me, I want a good consistent pull/perc.
Nice piece, abo. Wish I was in the market. I like stuff, that's not real mainstream, but enough of a name and obvious quality of the piece... to be very desirable. Good luck. If I win the lottery, I'll pretty much, buy out the classifieds. So you can always look forward to that.