I have zero experience of these straps but I'm going to throw out some impressions anyway...
The stitching at the top of the straps is horrible, and those are the ones they've chosen to photograph so presumably the best of the bunch.
The black strap is pictured with the ugly side of the rivet facing outwards, that'll look horrible of the wrist. The brown strap is pictured with the ugly side of the rivet facing outwards on the long end of the strap and the smooth side of the rivet facing outwards on the buckle end, this inconsistency doesn't point towards a product made with care.
For £40, calling those premium seems a bit of a p*ss-take.
Anyway, a G10 always looks best on a ratty NATO.