This fall, went through an exercise on my two high-mileage LFS Lew's, Super Duty and Custom Inshore.
Both of these reels have excellent mag casting brakes.
I'm not like Josh and take them down religiously - I may not fish as much as he does, always lube before every trip, and at least rinse, dry and lube again after every trip.
My 3rd, Lew's Tournament, has only been fished once, when I needed it for back-up. What I noticed about that reel, without mag, it's not as reliable casting into the wind, and casts 12-lb fluoro well-enough when casting enough weight. The Super Duty has the best mag, and I first made the switch from 12-lb fluoro to 20-lb braid. Fished it last week at Arroyo, and it cast like a jewel, especially accurate casts from the kayak into the mangrove edges.
On both of my two Lew's mag baitcasters, made the choice to switch to braid - at least, one at a time, after proving my result to myself. Along with this, I gave them new spool and spindle bearings - un-shielded bearings.
Also cleaned and lubed the drives this time while I had them down.
The shielded bearings that came in the reels are comparatively stiff, you can't really clean them, can't oil them, they don't really seal, and you're stuck with whatever lube was put there by the bearing supplier.
With the unshielded bearings, I can pick my own lube, and they really sing.
There's also no reason to go with hybrid ceramic because the inertia of the line mass on the deep spool doesn't warrant it, but high-grade unshielded stainless. There's an ebay vendor who sells the 3 ABEC-7 unshielded spool bearings together for $20.
While I was in there, also noticed the only wear in both reels was in the pinion gear spool pin contact and slots. This is a place that really needs grease. For this reason, taking the spool out at least once/yr to oil the bearings and grease the pinion slot is a good idea.
I have the Super Duty set up for 1/4 oz and heavier - I added the longer-pitch handle to slow down the 8.3 gears and with its mag, has become my favorite reel.
I have my Custom Inshore set up on ML rod for 1/8 oz lures, and the combo casts them great.