It's typically no less accurate than the blood test systems are
@LaineyK.
I know that's not very helpful, but with its assistance, I've identified issues with Lantus insulin and moved to Levemir, and as a result, changed the way I manage my diabetes. I now "sugar surf" and my variance, while not being as good as others, is significantly better than it was, my average bg level is lower and my Hypo likelihood has reduced as I am able to determine what's happening more effectively. It's not so much the accuracy that's important. It's the ability to see patterns that is so much easier. I've also been able to reduce finger pricks.
I'd say it was well worth the investment.