I have 5 of these switches around my house in different rooms. Two dimmers, and three on/off switches. Currently they're connected to my original z-wave system I've had for several months now, and they worked perfect with it. I just got my second Almond+ in the mail yesterday (I installed my kickstarter Almond+ at my parents house), so I hope to be able to get all this setup by this weekend.
I'll be sure to update with the progress.
I'm assuming I have to remove any z-wave item from the first system before it can be used in this one... and the first system didn't make that an easy task.