What thickness glass are they using?
I definitely can notice it on the 270 gallon as compared to my old 90. I think the 270 is 1/2" glass and the 90" was 1/4" (not 100% sure about the 90). In any case, I did notice a very green tinge to the glass when the 270 was not set-up. Now that it is set-up, it is a lot less obvious and until I see the same tank with starphire it won't really bother me.
I think it is probably like VHS compared to a DVD... until you get used to looking at a better resolution, you don't really notice how crappy the other is.
In short...If they are using 1/2" glass, I'd consider it. On a thinner pane I don't think you'd notice it... particularly if you aren't used to seeing acrylic or starphire.