Is your doctor wanting you off it? My understanding is that it does not have much risk of causing a hypo, unless combined with some other glucose lowering medication. If you look at how type II diabetes normally develops, very often insulin will be elevated long before blood glucose is--you can have a perfect blood glucose, a great A1C, but still have insulin levels that are higher than ideal--so maybe there would still be a benefit to taking metformin, even if blood glucose is behaving. Of course this is a doctor thing, not a some guy on the internet thing.