I'm actually pretty happy with how the case came out.
Not going to lie, we did have a lot of problems with the window. The original plan was to launch this at the same time as the 230T last year, but once we decided to go with the full side panel window we had to determine how to do it. There's a reason nobody in the industry has done this yet - it's really damned hard and expensive. The manufacturing process didn't really exist at our suppliers so we had to help create it. We ended up with flow marks, cloudy windows, etc. This is part of the reason for the delay.
But now we're comfortable with the quality - it came out great. It really doesn't look like anything else on the market.
It's expensive - I'll grant that. But the overall build quality, compatibility, cooling, and expansion (and the full tower size) are the majority of the reasons for this.
The price gap will be $20-$30 more than a 750D. For that you get the swing out doors with tool-free latches, full side panel windows, front LED fans, and built-in fan control toggle (7V to 12V).
If it's not worth it to you, then by all means please buy a 750D.
Seriously though, I know that this isn't everybody's cup of tea. Graphite Series is about bold designs that will piss off about half the people looking at them for some reason or another.