I have a 3 die set from RCBS. The washer doesn't work perfectly for me. It does get me close but not exactly right. I am going to get another set of dies soon. I will be getting the Dillon dies. I have a Dillon press and those Dillon dies are very easy to take apart to clean. Much easier than the RCBS dies are. I will also have a separte die for the crimp with the Dillon. I prefer to crimp in a separate die. It just makes things easier for me.
One thing I do suggest with any die set you might be getting is to get carbide dies. They work well and there is very little chance a bit of junk on the case is going to score the sizing die and scratch every case you size after that happens.