As far as Roche, I used their heavy, huge, motorized Accucheck Compact Plus for several years…until I finally realized (no idea why it took me so long) that when I’d get a bit high, the readings were always higher than they should be, and if I got into the 200’s they were seriously reading WAY too high. I would do corrections off of those readings and wondered why I’d crash so much, so often. At some point I began checking them against some of the other meters I had laying around and noticed that the Compact Pluse’s (i had at least 4 of them) would always read much higher in the high range, than every other meter. I’m so glad at some point I switched to another brand and that solved that problem. I can’t remember if I switched to the Contour Next or another meter, but things improved. I do remember for sure that I began using the Contour Next Link when I got my latest pump in Dec of 2014. Contour Next models (I have 3 different models) all give apparently accurate readings no matter how high or low my bg’s are. Giving how great the correlation is between the G5 and my Contours, I’d say their accuracy is given a bit of extra authentication by those independent readings.