I can't offer a success story either, BUT im on 1500mg Metformin (i just started taking it again) and i will be on 50mg Clomid CD 5-9 starting on my next cycle. Im not TTC my first, but i never had any issues with TTC (not that i was ever really trying) and of course not that i AM ttc i have issues ! Also i conceived all my children weighing 210, or less, and im now weighing in around 245.
To warn you about the Metformin, and at 500mg you may not have much of an issue, but it can cause some GI upset (gas, bloating, diarrhea) and the clomid side effects can be the same as early pregnancy and or AF (since there's not such thing as early pregnancy symptoms, all "early" pregnancy symptoms are exactly the same as AF symptoms). I got really excited for sore boobs my first cycle of clomid (i only did 2 cycles, a year ago) and then had my period lol. I shouldn't have googled but i did and i realized that the clomid side effects can mimic most common pregnancy symptoms... just to warn you