I have several penguin filters, the oldest being a 330B, newest being the new 350, and the 100B. the 330 is kinda nicer than the 350, cause you can adjust the flow rate, and the extra media baskets can hold ALOT more extra media than the extra media baskets on the 350, which doesn't have adjustable flow either...
but I do like them all, once they are broken in anywise. first several weeks they are kinda loud...mostly splashing and stuff..