Vigilante, I needed eight of the Forster rings for eight dies. I keep the rings set on the dies so the quick die change can be completed without having to adjust the dies for each caliber at each reloading session. With the rings set on the dies it is just a matter of sliding the dies in and out of the co-ax press for each of the reloading steps. Sliding the dies into and out of the co-ax is probably similar in convenience to the Hornady Lnl system or the Lee bushing system. I have used the Lee bushing system and it is very good. I have never used the Hornady Lnl system.
Also, there is a probability that I might need additional Forster die rings in the future. If so, I now have enough for another caliber. As I recall, purchasing a 12 pack of rings cost about the same as eight individual rings. I have already purchased new 6/32 x 1/2" stainless cap screws with a hex drive drive head to replace the Phillips head cap screws which come with the Forster rings. Also as I recall, most reloaders who made comments about the Forster rings suggested switching to the screws I described in the previous sentence.
An extra comment: I also tried using the Lyman and Hornady rings on these dies to see how those rings would work with the Forster co-ax press. They fit kind of okay, I guess, but they are much too loose for my liking. The Forster rings fit best-nice and snug with just enough "float" to allow precise alignment between cartridge and die.