I just got one. I certainly hope they're not garbage.
I used to have a C series (?) that rocked. I still don't know why I sold it. At the time I thought I wouldn't start another big tank for awhile...yeah right. Anyway, the design is virtually identical. As far as I can tell, the C series is simply wider. The height and the pump, the position of the plumbing, it's all the same.
still good quality but less so than the c series. otherwise works great. If you dont intend to play soccor with it or hit it with a baseball bat i dont think you will run into any problems.