Hey JamesMJ2,
I have the Sea Clear 40 gallon tall tank. It is a beautiful tank. However, if I had to do it again, I would probably go with glass.
Acrylic does have it's good sides. It lighter than glass, stronger than glass (17 times stronger in fact), clearer than glass (around 5 percent or so), and it is a better insulator than glass. With all these good points why would one still choose glass? Acrylic scratches REAL easily. Much easier than glass will. My tank is only about a month old and I have a few scratches inside of the tank. I was wiping off algae inside of the tank one day with a super soft painters brush and all of a sudden noticed that I had scratched it. Upon further inspection of the brush I noticed there was very fine sand grit in the brush. Now acrylic scratches will buff out a whole lot easier than glass would, but at the same time, if I had a glass tank, this never would have happened.
I think even with all the good things about acrylic, glass is still the best bet. It is also cheaper so it fits most people's budget a little easier.
If you do get an acrylic tank, just make sure that you be careful when working inside of the tank. Also make sure that people don't have sharp objects around the outside of the tank. Mine in located in my retail store and I am constantly telling people to "Stop touching the tank!!"