It is true that it's not pretty but I am so used to using it that I have grown rather attached to it's aesthetics. I actually have two of these but the other serves purely as a spare in case this one dies. I have seen old "Tulip" branded PC monitors which are identical to the Performa Plus in every way except they are VGA and can display at 800x600. This suggests that Apple just re-branded a PC monitor as the Performa Plus (it doesn't even have an Apple logo on the front).
My favourite has to be the Macintosh Colour Display though, as it is distinctly "Maccish". Mine unfortunately has a habit of making a loud, high-pitched whining noise which suggests that the flyback may be failing, so I tend not to use it much.