Most folks go with the 520 conversion, which saves some weight. Staying with the stock 530 size is fine, too, as the weight savings with the 520 won't really be noticable. If you want to change gearing, this is the best time to do it. Depending on what gearing you use, you may need a slightly longer chain. From what I understand, the smaller 520 chain will wear as well as the larger 530. Just remember to change both sprockets when you change the chain.
I installed an RK 520 GXW and have about 12,000 miles on it with Vortex sprockets. It has done me well but is developing a few tight spots and will be replaced this winter. I like the 520 set up much better, lighter and seems smoother.
They all have a master link. The pressed links are much more secure than the clip type, though.
The clip type are OK, there is just that possibility of the clip falling off and causing a problem or two.
I think DID is the only one that makes what is called an x ring. I think they patented it. It's like an o ring, but the o ring part is shaped a bit differently, like an x, kinda. They claim it works better. If you go to the DID site, I think they explain it. I forget offhand how it works. It's really an O ring type chain, with a bit of a difference.
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