At my previous employer, we had been using MVP Lightning units (the older version), and were looking to possibly upgrade. We had representatives from 3M and Neogen come to demonstrate their units, and we were able to do some hands-on testing with them. We also had MVP come with their new Icon unit and do the same. Everyone provided "data" that showed that their unit was superior (of course), and to be honest, it was difficult to wade through all of it to determine who was truly the best. In the end, we decided that it was basically a wash, and that we would decide based upon how user-friendly the units were. We finally settled on the new MVP Icon unit, as we found it and the supporting software (and company support) to be the easiest and most helpful. My advice would simply be to figure out which unit works best for you - have each company send a rep with a demo unit, and have them leave it for a few days (or longer) so you and your team can try each one out...and decide for yourself which one you like, because I don't think there is much difference in the long run between any of the top fore-runners (MVP, 3M, Neogen, and maybe Charm?) in terms of accuracy.