Is this TV calibration site for Dishplayer/Webtv/Ultimatetv any good?

Are calibrations made on your tv with this website any good, or are they worthless and you should just buy the Avia DVD instead?

http://www.angelfire.com/mt/jdhardball/pictureadjustment.html

[MarkA]

They could help some but AVIA or Video Essentials is probably overkill. Personally, I think the THX test patterns on about half of all DVDs are about right; not overkill, but not too basic.