Well I just took delivery of 2 Duel Gems. I put one at either end of the t-bar and struck up a bit of UB40, and I have to say that I'm very pleased with them.

The crisp LED colours were bright, and danced beautifully, even in broad daylight. And there are certainly a lot of patterns in this unit, including a strobe effect. It reacts well to sound to light so I'm confident that they'd look great linked together.
At 1.7kg apiece they are easy to transport, and at a mere £64 quid there's no excuse to pass these by.
This is the first bit of ADJ kit that Iv'e added to my stuff, but going off these baby's they won't be the last :)

im not sure they link together?

Actually they don't. I got carried away lol.

I recently bought a pair of these also!! Great lighting effect in my opinion, try them with a bit of smoke and you will be very happy.

Also, i have just purchased an LED Mirrorball by ACME, works well with these lights suprisingly and only cost £50.