When I first encountered WAYK (2010?), I tried it out with my then flatmate, who had spent some time in the Netherlands. We only went on for one hour max, but it was pretty much fun, and we went up to want/have/give/take quite fast, and then did some glue words.
Last week (mid-2012) I talked with her about this day, and she still could do the signs for “appel”, “maar”, “stift” and several others. Amazing :) I also remember some Dutch from then, despite not having used it at all since then. Dutch is pretty similar to German, and I’d really like to hunt it again soon, because it should be easy to get deep into it, and practice lots of deeper Language Hunting techniques through it.