Just had to replace the band on my Luminox 3050/3950 watch.  The old band broke after 5 years roughly right near the buckle.  The material this new band is made of seems to be a bit different from my original band, but maybe that could be because it's newer looking?  Hard to say if it's legit or authentic for sure.  Seems to be a bit overpriced for a bit of rubber or whatever it's made of.
I have a Nato style watch strap I was using on my Luminox watch for a bit which worked pretty good and looked alright I thought to.
But as long as this new band holds up for several years that's good enough for me.