On one hand it is nice to be able to choose a device from any manufacturer, and for the most part you can and it will work. The issue for me is that all the manufacturers use different size/color/brightness LEDs and different methods of engaging the air gap. So, from an operation perspective I would not be too concerned and if I needed a lighted multibutton, I know I could use the HAI or PCS, but from an aesthetic point of view it is difficult to mix and match manufacturers, at the very least in the same room or common areas. Heck, there are even differences in LEDs within the same brand from model to model. If there were a standard for LEDs and colors, it would make it much easier to cross manufacturers but otoh I guess it is nice to have a choice. There just is not a single good answer.