Sorry but you are both wrong about Metformin.
It may not work for you two but I am LADA and it is making a massive difference to me! My BS is generally always between 4mmol and 8mmol whilst I have been on Metformin but when I came off it to switch to the slow release version my levels shot up to 10-12mmol despite me not changing my diet at all. I also wasn't ill or anything else that could have affected my levels and as soon as I was back on the Metformin for a few days my levels stabilised again.
Because I am LADA the Metformin won't work forever but saying it doesn't work at all is clearly wrong as it works for me. It also doesn't affect the taste of any food I eat.
Diagnosed with GD in 2010, Completely disappeared postpartum. Re-diagnosed December 2012 with type 1.5 diabetes, age 26, BMI 22 currently controlled by only Metformin, 500mg twice a day.