I'm one of the lucky Sentry 1.x (white) owners and after ~1 year and 2 systems in it I found some areas of improvement that might not have been mentioned.
The lip on the toppanel, that slides below the frontpanel and holds it down creates kind of a dent in the center of the line where the panels meet up. I fixed it a little by bending the lip down a tiny amount. It's better but not perfect. Maybe removing some of the paint on the lip makes the line more straight but I'm still reluctant to do irreversible mods to the case and it's only really prominent when viewed from certain angles.
The other thing is the strip of metal between the PCI-E slot-plates. I know it's standard, but blower-style cards really benefit from bigger exhaust-area and the strip covers quite some area, that GPU-makers "illegaly" use. It would be a simple mod to grind it out but as before I'm not at that point yet.
I'm really stoked about 2.0 although I'll most certainly stick with my 1.x
great job guys and good luck with the next version