Just pick up a never used Islander MR3 for a great price, the model with the ported back and fully ported spool. You can look through the ports on the back and the ports on the inside of the spool and see the line and backing. I understand Islander also makes the MR3 with a solid back. There must be a reason why they make both types. Does anyone know the comparative advantages/disadvantages of the two? Any preference for one over the other?