Probably steve, the main reason you want to shut this function of SVM or VSM off is because it robs fine detail of images, it distorts it. you will notice after a while by looking at fine details like someone holding a gun to the sky for example in a movie.You would'nt see the tip of the gun since the edge enhancement would hide the fine detail.Same thing goes for a highly intricate scene with a lot of lush detail like blades of grass, yyou would'nt see any details because VSM would be obscuring it.VSM gives you the impression of a sharper image by adding false outlines on edges of objects, this in turn ruins fine details and results in a cookie cutter look that robs image crispness and clarity.
To sum it up the picture quality will look ultra sharp with it off instead of on.You may also want to check the MID5 table in the service menu starting with POP.POP is a different number for each input and resolution, you don't adjust POP, im just saying that's what the edge enhancements start at, you adjust the next itemafter POP and make sure the rest are set to 0 for all inputs and resolutions.
I ask this because the MID5 table is where there is a huge amount of edge enhancemnts and blurring enhancemnts that should be turned completely off if you want a really ultra sharp picture.
Also just because you trun clear edge off in the user menu, it's not completely off in the service menu,i learned this on my own with my discoverys in the service menu.If you want your tv to look as crisp as can be like a pc monitor for instance VSM has to be completely turned off, ass well as the MID5 table, and turn SYSM to 3 for each input and resolution, and SHOF to 0 as well since that's an sharpness enhancer which adds noise to the picture.
For any questions on how to do these more specifically and in detail, ask away!!! i have a service menu chart with all the codes and what they do, i'll gladly help your set look the same as mine, like a million bucks!!!;)