I have a 55" ST50 on order from Panasonic's Friends and Family for a co-worker which was an unbeatable deal only bested by what they had on the ST30. He decided on the newer model. I've purchased hundreds of Panasonic commercial TV's. The only sets where I could get a 5 year warranty on TV's that need to last 8-10 years. I currently have the 46" GT24 floor model I bought at Costco and have been very happy with it. I started with a 42" ST30 but returned it because the plasma buzzing on whites was excessive and then I noticed the buzzing on all colors was a bug light which was not normal. The smoothness on the ST30 was noticeable compared to the GT24 which is my only regret.
The co-worker I'm buying for lives in an apartment with supposed light challenges so the improved filter will be welcome. Having seen/owned 2 previous bang for the buck Panasonic 3D plasmas, I should be able to pull together some decent comparisons. I ordered on Friday, so hoping for early to mid week delivery. I'll post when I have the opportunity to get it setup.