If the positive reviews far outweigh the negative there is more than a good chance that the effects for the vast majority will be limited.. but the positive effects in regards to better insulin sensitivity etc may well be worth a slight drop.
If.. if one gets a negative effect such as weakness etc then by all means stop taking it. I personally don't like rhe way metformin makes me feel.. I got off it.. I use berberine. But the majority of my friends take metformin with no ill effects.. no weakness. And no loss of gains. So its worth it to them..
You seem also to be getting a bit of a attitude.. you want to positively debate the topic great.. you want to have a attitude questions many on this thread that I'm sure are just as knowledgeable as you or more than stay off the thread.. or the board if it bothers you..
I'm not going too much time on the last part of your post, as all I did was point out that the assumptions and metaphors being portrayed as the final answer in this thread should be taken with a grain of salt the same way that a single study on elderly women should be taken with a grain of salt.
The fact that you personally don't like metformin is useful. The fact that you've known people who use it with no issues is also very useful. Just like the small handful of anecdotes I provided are useful. And the small number of studies we have on the issue is useful as well.
That's the kind of stuff that this thread should be about.
Dogmatic statements like "It's not going to make a difference to people on gear", or a slick metaphor involving a Ferrari, without any background context is basically useless.
I've been around this scene long enough to have seen dozens of examples over the years of bro myths and conventional wisdoms (that turned out to be horseshit) that the "old guard" would repeat ad nauseum, and anyone who dared challenge them was mocked and accused of having an "attitude".
Of course, that's not always the case, and there was a ton of wisdom contained in the same posts.
But yeah, you learn to take those kinds of statements with no background info with a grain of salt.
My view is that the book isn't closed on this subject, so thanks for providing your experience. I'm personally not sure what to make of it all.