I have tried a couple different bearing upgrades, both abec7 ceramics, and found a little to be gained, not a lot but a little, mostly on the lighter end throwing under 1/2 oz, as with most the 5/8 mand up didn't see much gain. Like all reels you gain a little noise with the ceramic, but gain a little smoothness also. The Lews seem to come with pretty good bearings right out of the box, but I got better performance after I flushed them and run some secret sauce in them, and am sure any of the lighter premium bearing lubes would show some benefit. Since they are stainless even the best can be improved a little with quality ceramics. Weather the small increase in performance is worth the price, that would depend on individual! I just happen to do this as a job so I want mine at peak performance as a sample. You have to decide how good is good enough, and these reals are very good right out of the box!
But I think the drag needs some help. Unlike the Shimano, that will generally match, or have slightly more stopping power than it is rated to have, and run smooth light to lock down, the Lews won't make it's factory rated max. I have tested a Team, a Tournament Pro, and a Tournament, and instead of the 14lbs. they are rated for. I'm only getting slightly over, or under, 10lbs with all three. this is plenty for most, but one reason I went with the Lews, was I wanted the 14lbs. they say they have, and although there very smooth at the light and medium settings at full lock down not as smooth on start up. I have fixed that by lubing the drag, as it is dry from the factory. These were all new reels this spring, so I don't know about earlier reels but that's what they were putting out from reels that were arriving this spring. I will try upgrading the drag with the same washers I use in the shimano reels, if I get as good a results as I do with the shimano the Lews drag will get close to the rated max braking power they advertise, and will be butter smooth light to max, same as I get with the Shimano. The thing stopping it from reaching the Max poundage it is rated for, I believe, is the bottom washer under the drive gear. It is a totally different material than the washers on top of the drive gear which are carbon, I don't know why else the two different materials??. Plus they run it dry, so it is smoother once some drag grease is applied, I think this bottom washer, which is smaller, is different to keep a smoother start up to make up for the dry drag with the type washers being used. I know when I replace the Shimano washers from the Dartainium, with my upgraded washers, I always run em wet with my favorite drag grease, this makes the Shimano run like butter from light drag to full lock down, and I gain 1 1/2 to 2 lbs more stopping power. So when I run a few drag upgrades I will let everyone know how that works out.