I have an RJ60+ for my 18,000 gallon pool, so it's more than 3x, but I think it is well worth the extra money. In addition to what Newdude alluded to about better longevity, it also gives you more options. For example, for my son's birthday party next month we'll run the automation in spa mode all day to keep it at the right temp. So, I'll turn the SWG off that whole day (otherwise the FC in the spa would go too high over the course of 12 hours of spa mode). So, to prepare for the party, the night before I'll run the SWG in Super CL mode, which will raise FC by a few PPM to give a buffer for it being off all the following day, then that night run in Super CL again, and FC the day after the party will right where it needs to be, and I'll go back to normal with the SWG.