So I took the bait on a Woodpecker's DelVe square back in Feburary. This was an encore One Time Tool. Looks to really be a little swiss army knife of layout squares. Very cool and very well designed. I suppose the question will be whether one can adopt the various capabilities into your work habits, especially if you are accustomed to using say, a Starrett mini double square or something else. If I can get into the habit of making it the go-to tool for layout and marking, I can see it becoming indispensable.
Funny - if you bought it during the February ordering window, it was $49.99. Right now I see one for auction on Ebay and it's up to $177 with two days left to go in the auction!