It's described as "Tri-Mode" in their part description so if I had to guess I would assume that it does not remember the settings if you switch resolutions. That was the downfall of the very nice Niemann trisync monitors that were discussed on here awhile back, at least in regards to using them in MAME cabinets.
Speaking of Niemann, I believe their 24.8" monitors are cheaper as well so if you are going to go for that type, you might look into them.