I have several GE switches and they do work well with ST’s, but keep in mind that GE and the Vizia RF+ are not functionally synonymous. If you have any need for “instant status” updates, you may want to stick with the Vizia RF+ line.
@JDRoberts has covered this subject quite well on several occasions. Here are just a couple of links worth reading:
I’m using the GE Smart Dimmers with LED lights and LED Recessed Lights. They work really well and I really been worried about the delay on the three way switches. My previous dimmers were sliders, so that has been the biggest change. The GE Smart Dimmers actually have given better lighter whereas my old switches sometimes caused a bit of flicker with the LED lights, but the GE Dimmers are great even are really low levels.