I bought the 525 mag2 as my first multiplier, and attempted to learn to cast with it, i stuck with it and after about a year I rarely had a birds nests however every now and then it would bite leaving me wondering why.
A few months back I had a shot of my pals abu 6500 rocket I was instantly impressed, smoother, easier to use, and in my opinion more forgiving than the penn, I bought a rocket that weekend and have been using it since.
Gutted to stick the mag2 in a box as a spare I decided to play about with it, I had already cleaned the bearings and got rid of the blue grease oiling with red rocket fuel when I had bought it, so I had a look at the magnets, I removed 2 of them, if you number them sequentially I removed numbers 1 and 3 leaving two magnets.
I used it this weekend and what a difference, I would say that it is twice the reel, casts better, smoother and a lot less jittery and noisy, full session mags backed of two thirds and no birds nests, a good day fishing.
This is my first post and this info is probably well known so it is aimed at beginners like me, hope it's ok!!
One last thing, now they are both casting well I would rate both reels highly, penn for heavy rocky marks and the abu for lighter sandy marks, this is because I think the penn has stronger gears and drag, cheers!