First rule. Standard definition signals look like CRAP! Yes, you can tune it. And even get them looking decent on this set. But if you keep it in your mind that most SD signals will look like CRAP then it wont bother you when you see it on the XBR4 for the first time ("What?! I spent $$$ on this set for this!!!!") Relax. That's the way all SD signals look on HDTVs. It's a learning curve.
But when you put a clear ESPN (not all of them are) signal or Discovery HD or inHD signal. You'll be like "Wow!" And for blu-ray or hd dvd. Or 720p/1080i/1080p games....you'll be like double-wow! Since it's as pure a signal as you can get.
Once you see pure high-def. You'll never go back. Even if you just have to deal with the standard definition "potholes" now and again.
Standard definition "potholes" = Chanel surfing on HD...."Purdy, purdy, purdy...ow! my eyes!....purdy...purdy...."