We also went with acrylic for our 375 gallon due to clarity and strength (impact strength in particular, as a pool table was 5 feet away - we've since sold the table due to lack of use). This is a fish only tank without metal halide, and the algae build-up on the acrylic is easy to remove with a magnetic cleaner. Also, sea urchins are not allowed in the tank.
After 3 years, we have only one 4" scratch from cleaning (sand dragged up during cleaning), and three 1/8" scratches from falling rocks. We know we can remove them with a product like Micro-Mesh, and as a result, they don't bother us.
Our previous tank was a 72 gallon bowfront, and once it got scratched from sand in a pad cleaner, there was no repair possible. The distortion from the bowfront also affected close study of the tank.
We're still happy with the acrylic tank.