Which of the Butterfly displays are people talking about here when it comes to light leaks and low volume? Do the round and rectangular displays differ in this regard?

Also, does anyone have any experience with reading PowerFLARM data on the following:

LX Nav V7
LX Nav 8080 and 8000
LX 7007 colour
Colibri II

Due to limited panel space I may well have to get by with a brick feeding one of the above rather than use a dedicated display when I finally get around to installing PowerFLARM (I'm certain to have to go this route if I install a transponder as well)