The difference from Dexcom and Verio Flex One Touch averaged 30-45 points difference. Dexcom was much lower. I used the Dexcom for 1 month and I'm very dissatisfied with the Dexcom. They only allow 15 days to test it and unless explained very well i liked it. But when I continued using it I began to monitor it with my meter. I am very dissatisfied with this product. User's recommendation: Check blood sugar with your regular monitor before trusting the Dexcom. You cannot get refunded for unused products.