If you go to the Vertex Standard website http://www.vertexstandard.com/
you will notice they also produce Yaesu amateur radio gear, long considered to be top-notch gear by most hams.
Motorola now has controlling interest in Vertex Standard http://www.reuters.com/article/mergersNews/idUST30762720071105
and for once a purchasing company has agreed to leave the existing one alone since they know what they are doing. I was worried when Motorola bought them but so far it doesn't appear to have made a change. For once someone figured out they shouldn't fix something if it isn't broken
I have the GX3500S as my primary VHF and the GX1255S as my secondary, both great radios, highly recommend either one.