I use the Esge twin-legged kickstand on both my tandem and triplet, and they have held up well even under heavy touring loads (i.e., weight of a tandem + panniers and stuff). I think they are indispensable. Another really nice aspect of using one is it serves as a built-in workstand, allowing you to adjust the drivetrain, rear brake, etc., very easily.
I think the Hebie (sp?) two-legged stands are heavier than the Esge, BTW.
I once bought a new Esge stand and cut it down. I measured at least three times and cut it carefully. Don't know how I screwed up, but it ended up way too short. So, be careful! The old "measure twice, cut once" concept failed me on that one.
For those traveling to Europe, Esge two-legged stands can be had for about 25 euros, at least in German bike shops. In the USA they go for $45+ (which is about right, given the exchange rate).
On my tandem I had Stephen Bilenky weld a custom kickstand bracket behind the BB for the Esge. Well worth the $100 or so he charged. I'm going to have him do it for my new triplet, too. On my Cannondale single touring bike I use the area behind the BB to mount the kickstand. It looks to me like it was designed for mounting a kickstands (a big flat area with a hole in the middle), so I'm surprised they warn against it. Most of their hybrid/trekking bikes sold in Europe come with kickstands.