I just bought a Viewsonic E70f which is basically the 17? version of the E90f. The A90f?s are retail (Staples, Office Depot) versions of these and are to my knowledge the same monitors as the E series.
The color saturation (graphics) and text quality I would rate as excellent.
The only downside to these Viewsonic series monitors seems to be that they usually have some minor geometry problems that are not totally correctable using the adjustments like ?pincushion, trapezoid ?etc.). For eg, the first one I bought had a slight geometry drop near the top middle of the screen and there is no vertical pincushion to correct this (only horizontal pincushion). I ended up returning one and am satisfied with my second one even thought it isn?t perfect. I?m probably a lot more picky than the average person when it comes to stuff like this.
I suspect most monitors have some slight geometry imperfections and an aperture-grille Sony tube based monitor might be better in this respect. For the price $260CDN (my 17?) I still think it the Viewsonic is a very good monitor considering its budget price. The Sony 17? was a lot more expensive at $460, so one might get what one pays for, but those minor geometry (very slight curvatures) I can live with for a savings of $200. They are very hard to notice unless you?re looking for them.