I just wanted to circle around on this topic.
I bought the Linear switches that Ryan recommended: Main Dimmer switch: Linear WD500Z and Auxiliary (for 3-way): WT00Z
The switch works perfectly for dimming, even with dimmable LEDs. I can take the lights clear down to 15% power and they dim right down just like incandescent bulbs.
The only thing down to these switches is that the 2GIG GO Panel can’t associate the auxiliary switch with the main switch, so I don’t yet have 3-way working. The design of these switches is that they communicate via zwave for 3-way functionality instead of over a traveler wire like the GE/Jasco switches. According to this Linear technical bulletin released last month, you need the Aeon Labs Minimote to associate the 2 switches: http://www.linearcorp.com/bulletins/TB2014-001.pdf
Perhaps given that this technical memo was just released, Linear will include the z-wave “associate” function into the next 2GIG GO Panel firmware update.
I did order a Minimote so I can associate my switches. I’ll report back if it works or not. Keeping fingers crossed…
Bottom line is that these Linear Z-Wave switches are MUCH better than the GE/Jasco Z-wave switches you buy at Lowes.