Cant comment on the 525 mag2 reels as dont own one. Had a 525 supermag few years ago and tbh was a bit on the lively side with 18lb line on it and ended up loading it with thicker line.
I do however now have a 515 mag2, essentially the same reel as the new 525 mag2, just a narrower cage spool and spindle.
15lb line (plus leader), bearings oiled up with red rocket fuel, it casts silently. Is very fast with the mags low, and will result in a birds nest if misstimed though
Retreive wise, still silent. No grinding, no wear of the spool, no issues with the gears wearing over the few years ive had it. Has reeled in god knows how many huge rafts of weed, the sort that with an akios/abu style 6500 sized reel youd have to pump the rod to get it all in. Takes it in its stride.
Did however have to tinker with the magnet holder and file the back down a touch with a nail file as it sat a little high and if the magnets were on full, would ever so slightly rub on the spool side.
Undoubtedly QC issues at pure fishing, just like other mass producing companies/factories in china, as there probably are some absolute dogsh*t reels doing the rounds now by all accounts. Dont mean theyre all the same though.
Wont be parting with it all that soon
(Unless someone has a tf gear smag 65 they fancy doing a trade with hint hint

lol)