Millenium KS-2010 EX

I use this extension to "link" two x-stands and have an upper keyboard while playing standing. Varying the distance between the lower stands solves the problem of the limited adjustability that you may face if you play seated. Also, you can improve the stability by having the braces tilted to the side. In the upgright position, they swing quite a bit if you play heavy.

Pros:
- Low price
- Stable, at least in my application

Cons:
- Cheap build: one of the screws is scraping against its hole, even when loose and not mounted.

In conclusion, I would suggest giving it a try and see how it works on your setup. Worst case scenario,Thomann's aftersales service is always on point.

EDIT: After a couple of months of reharsing 3 days a week, one of the threaded holes has broken. I had to replace the tightening screw with a slightly bigger one, otherwise it would not clutch on the stand.

I bouth this for my 49 key midi keyboard that weights 3 kg and while the stand does hold it up securely there are a couple of problems (at least with mine):

1) my keyboard doesn't sit flat. I fixed that with a little bit of padding on one corner
2) I wish the vertical posts could be taller. it doesn't make sense, since normally a keyboard stand would be set-up quite wide and because of that the vertical posts of this extension would have a narrower angle resulting in less vertical height
3) those plastic things that hold the keyboard from sliding down aren't mounted in the same angle and one is not holding my keyboard at all, but since I use the midi keyboard very lightly it's not that big of a deal for me.
4) maybe I didn't notice but I'm pretty sure that the nuts for those bolts that you use to mount it to a stand were missing

All in all, for the price and for what I need it works great!

I needed a solution to stack my Stagepiano with a Mini-Synthesizer, so I bought this realitve cheap solution. I use it with the Millenium KS-2010 and it was easy to mount the Millenium KS-2010 Ex on it. It's stable and doesn't move if you locked it, but it's a little bit annoying, that you've got three "Fixpoints". Also it doen't have a Quicklock for previous settings, so you have to adjust it every time. Further you have to get it exactly parallel, because if one of the legs isn't as the same height as the other, your keyboard is going to wiggle while playing, very annoying. But after a while you're going to habituate with it. So it's a cheap, stable solution, though, I wouldn't buy it again.