I have not used SSR1, but I do love my SFP. SFP has always left a smooth and clear finish on all cars I have detailed. I have found it to be very easy to use even in the sun. I always use less of it than I think I will need though. Small amounts go a long way. After wiping SFP with an alcohol wipe I have not seen any signs of fillers. Of course I always use a rotary with SFP so if it is used by hand or PC you may not get the same results. I have heard that Meguiar's polishes tend to have some "oils" in them which are AKA fillers, but I am not too worried since SFP is just my final polish anyway. I only use SFP to clean the paint or get rid of some light cob wobs caused by washing.