The biggest problem I found with Boot XP is that it only uses 16 colors. So, you can basically forget about any nice boot screens. I found a nice dolphin one, but when it loaded it looked terrible because of the 16 color limitation. 256 colors would be acceptable but to degrade every image to 16 colors just isn't enough resolution for even the simplest of backgrounds. Look at the window part of the original image. It is terribly pixelated.
Also, there is a problem with the thing that scans like an alien eye. Moving that image around is a terrible problem too. It never stays where it is put. I gave up on BootXP for these reasons.