We operate the 90B almost exclusily in our fleet of PC-12s. I love the box and would be lost without it. A couple of managed PC-12s have the 400 or 500 series in them and they are OK but I still like the 90B. I guess we are spoiled though, because we have it hooked up to both EFIS and a nice KMD-850 MFD.

I guess folks just like what they are used to; I have been using that box for almost 4 years now and can program it with my eyes closed.