The expansion card is definitely a plus. I like the square boxes better than "shapes" as well.Ghl only kinda needs windows, really just for firmware updates. And hopefully this is changing. A nice part of the profilux 4e is if do want more probes can just buy expansion cards for the unit itself. Instead of adding endless modules. i added a second ph probe to mine, for a carx. The windows computer i use for updates is a really crappy used laptop, doesn’t need to be state of the art.