I upgraded from a 9 gallon cube to the deep blue reef ready 30 gallon cube rimless and love it. To me, the glass is very clear, and I dont have a single complaint about the tank itself. Even though the rimless could be a pain at times, do not get the rimmed version. the rim makes the tank look even more shallow. You can make a great nano reef in these things. Im keeping everything from SPS, anemones, LPS, ext.
big tip: replace the supplied PVC they give you for the durso drain and cut one SLIGHTLY taller. This will reduce the water from splashing down from the overflow and make the system WAY more quite. if you have questions on this PM me.
my buddy loved my tank so much he went out and picked up the Deep Blue 80 gallon (48X24X18) and its awesome. If you have the room go with that tank for sure.