So I grabbed a 1970VX:
The good:
Make a cable, plug it in, it works. Displays low & medium, easy to adjust to full screen, 50 and 60 Hz work great.
I haven't tried mono yet.
The not so good:
The scaler is pretty bad. Medium res is a mixed bag, it's difficult/impossible to get the image lined up so all the pixels show correctly (Capital M's are particularly bad). It seems to throw away columns that don't map well, I think it may be worse than the cheap chinese gbs cards on ebay.
Bottom line, or $20-30 bucks, it beats lugging around a multisync 2D, but the image quality is so-so
Edit:
So, an update, hooked it up hi-res, needed to adjust the screen a little, but it looks really good.