nice looking well built tanks, there is nothing really good or bad compared to a standard foot print beyond the usual issues you know about such as total area for oxygen to diffuse etc. I thought they were really overpriced though. I have seen some set up to look great however and I almost got one for malawi cichlids but decided on a standard 5ft long 110 with an overflow to save cash.
as for viewing angle I never really had that issue, I mean its different looking through curved glass but it didnt seem like a real negative, I mean most aquarioms have curved glass tanks and I think they look great.