So far that Chronarch SF in the left version has been a great reel. Of all the brands I have worked on and fished with, Shimano's Chronarch SF is by far tops for reliability, smoothness of operation, and toughness. I have yet to toss a Chronarch in either the regular 100A or the SF. Now that Magnesium reel is a whole other animal. I don't recommend it. The metal frame is so light of metal that they had to install a stiffener in it to keep the screws from pulling out of the magnesium. I just don't think its a lifetime reel like the first one and the Gold SF version. That and it costs another 100 bills.
I do trick out my SF's just a bit. I first remove the spool shaft clip that is located under the tension knob between the 2 white plastic spacers. This thing riding on the shaft slows the spool slightly. Removing it has no effect on the reel other than if you open the left sideplate, the spool could fall out. I always know I don't have the clip, and have never had that problem, nor have any of the guys who I have done work for. Additionally, I dress out the bearings with Rocket Fuel Yellow. First you clean all the grease and oil out by spraying it out with carb cleaner. Let them dry completely (about 45 minutes to an hour) then put in 1 drop of Rocket fuel. Your factory Chronarch SF will free spin about 8 to 9 seconds off the shaft, with these modifications, it should pick up to about 15 seconds. Installing ABEC 7 grade bearings will pick it up to upwards of 18 to 20 seconds. Additionally, I rarely use more than 3 of the centrifugal brakes, so I remove 3 of them. This lightens the spool slightly and makes it a little faster. You may also find it helpful to smooth the races on the frame with a dremmel where the spool rides. Most of the time, the spool doesn't contact, but under stress it can. This will smooth that out some.
Skipper