I use this (along with Mastersoft and Resco) on my X50v. The Resco is the only one which has VGA quality images, so far.
Both Mastersoft and Spiralmile (the newest version) have big grids and numbers, however, so they look pretty good (but not great) on my VGA screen. I've never had a problem with Spiralmiles on my X50v, although it's WM2003SE, and now WM5.