I have 2 of the 310's and 2 of the 320's. The 310's are my favorite reels. I have them spooled with 80 lb Power Pro, and they hold way more than enough line! I mainly use weights ranging from 4 to 6 ounces. The 310's will cast a little further than the 320's. If my 320's ever go bad, I'll replace them with 310's. I got mine from a friend for $40 each about 2 years ago.