My ViewSonic monitor is a normal monitor. This means it is not a RIPOFF. This means it accepts PAL input signals. And no it does not upscale it to 60 hz. That would be horrible. If some other model does that then yuck! Don't buy it! (unless there is an option to turn that off).
Everything looks normal on my ViewSonic. It actually looks better than my C= 1950 Multisync and my C= 1960 Multisync.
My ViewSonic displays PAL. My ViewSonic displays NTSC. My ViewSonic displays PC signals. I have everything connected to this one monitor with a KVM switch.
Be aware though, some Viewsonics (mostly the dirt cheap ones) do state a minimum of 56Hz so do check first before you buy.
I bought a couple of 1920x1080 widescreen models because I usually connect a PC to the DVI connector and a Minimig to the VGA input. Saves deskspace.
Oh, and on my A4000 I use one with the RTG Radeon attached to the DVI and the Indivision AGA attached to the VGA. Switching between modes is a case of pressing the button on the front, or it switches back to native automatically if you exit all of the RTG screens.