I actually had a few pairs of G-Star jeans before, but turned to Diesel and haven't looked back since. The quality of G-Star jeans is pretty shite, buttons and rivets started popping out from my new pairs! Never again.
On another note - I have a few pairs of Sleenker, and I find them impossible to wear with anything but Chucks. With boots, one invariably ends up with the "golf club" effect - not a good look. Just my personal experience.