I'd say it's well worth it...unless you want to go all the way up to 1-5/16", because adding those extra big dogs adds up real fast. So, if this will cover the sizes you need, yes, get them. And most of the time you can/have the room to run a +1" with a separate swivel.
I bought a set off evilbay that goes all the way to 1-5/16" for $355. They were new and the new style...that was a lot of money, but I had just profited from another sale and bit the bullet.