I'm considering an upgrade from a VM Pro 410, so I'd be interested in an opinion as well.
I can give you a view on Iiyama in general. I've been buying Iiyama units for both home and work since 1995 (probably over twenty 17" and 19" screens). The early 17" units had a niggle with the grille drifting out of position somehow (wobbling the monitor a bit usually fixed this). After about 8 years of use, one screen has just developed a convergence problem, and another is very flakey powering up out of standby mode. Considering these screens get 8hrs/day 5 days a week use, this isn't a bad record! Support is excellent. We had a next day swapout when monitor turned up with a scratch on the screen. As for image quality, I've yet to find a 17" or 19" screen that surpasses the VM Pro range (maybe the Mitsubishi tubes would, but I've not tried those yet).