My home configuration has two Planar 20″ monitors as my primary display. They have worked fairly well with the exception that any sudden change in input signal seems to cause them to freak out and changed their sync levels to non-standard ranges. Resetting them is the fix but Planar is kind enough to NOT mention how to do that in any of their documentation. So, for the benifit of mankind here is the process for resetting a Planar PL2010MW to factory default>
Unplug the monitor. Counting from the left, there are five buttons on the bottom of the monitor (the right most being the power button.) Press the second and fourth buttons from the left and hold them down while plugging the monitor back in. Count to five, and release.
Other models of Planar use the second and third buttons with variations of releasing immediately after plugging in; or waiting until the main power light turns green. In addition, if you are using some versions of Linux you may have to restart X before you see the minor in your hardware setup.