I thought I'd share my experience with Meermin:
I've had three pairs of shoes from them, two of which were a replacement for my first pair. The first pair was too small, so they agreed to exchange, at no cost for me. The second pair I received, was also a little bit too small, and I didn't really like the model, so they agreed again to exchange, at no extra cost. With the 3rd pair, there was actually nothing wrong fit and model wise, but it also had an issue as had the two other pairs. I didn't want to exchange another time, so I told them I'd rather get my money back. They even agreed to that, but this time I had to arrange the shipment myself. This was no problem, and they even wanted to refund the shipping costs!
So, even though all of the shoes had issues, I would still recommend them. The quality of the leather is good, the construction is good, but the quality control isn't that great. I think, however, that they wouldn't have been able to spot the issues, as they only appeared after I walked a bit in them. (except from the second pair, which was clearly visible before wearing them) And, if you've got any issues, they're willing to exchange, so I think you're safe buying a pair of shoes from Meermin. There have also been a lot of reports in this thread of members getting shoes with no issues at all, so I think it was just bad luck.