jspeterson,
My perspective is a little different than most as I work for a manufacturer. As a manufacturer, we rely so much on the great resellers and techs to really make our products shine. The interconnects all have their favorites which is why they carry the product lines. The top 15 PBX makers will have the same 200 or so features so that can't be used as a differentiator. So then it comes down to company strength - that of the PBX maker & that of the interconnect. Check stock performance, ask for references specific to your industry, look at the Better Bus. Bur for information. The good will always outshine if you do your due dilligence.
