Their prices aren't too good to be true, so that's a good start. I did a bit of Googling and could only find one post, on Reddit, where someone mentioned buying a knife from them.
For such a spartan website, I don't love that "Trusted Source" is one of the only non-sales pages on the site. That makes me raise an eyebrow.
If I were rolling those dice, I'd pay with a protected payment option (credit card, PayPal) just in case.