I sent slightly over the minimum to an address this site generated 4 days, contacted their support email, and have received no response and no coins back.

Reasons this is shady:

Within the site the same tumbler ID is re-used across multiple transactions and the PGP signature was the same with different transactions, even with a different deposit address. I made sure to try it with two different browser sessions to make sure it wasn't sticking.

The deposit address changed after I sent money to it.

I'm glad I did a small test of (minimum 0.3 XMR) before sending the full amount, but it still sucks to lose money.

SCAM : monero-mixer.com