Metformin & Glucophage

Below is a thread from `06 on metformin use for fat loss; the thread is locked otherwise I would bump it.

I am interested in using metformin to improve nutrient partitioning. From the linked thread and from other sources it seems that the only downsides to metformin use are:
The rare cases of lactic acidosis which can be prevented by proper hydration and avoiding alcohol.
Gastro-intestinal distress for some users.
A potential suppression of free testosterone in some men.

If anyone has used metformin or has any good information I would be very grateful for your help.