My 630 is in Great condition "stretch" wise...with absolutely no play...but there are a few stiff links from sitting soooooo long. I had it soadking in ATF fluid for almost 2 weeks... it made a HUGE difference...but still a few stiffies. I'm sure it would "unstiffen" really quick with a few rides...I've always just been horny for some Gold chain... and the more I think about it...the more i LOVE the BEEF of the 630.... everybody who's been to my place and seen the chain have said... "HOLY S^%T that's a big ass chain" And I'm like..."yeah" ...that's how I roll dood....big and heavy...
All good fun. I really like the idea of weight savings with the 520/30...and the plethora of availability...but girth is cool too! ahah I'm still up in the air about it.... but I'll probably stick with the 630 for now.
And I may even do what you say...make sure the M.L. is good, or buy a new one and ride on that for a bit until I know if I want different ratio's or something! (which would quickly lead me to the 520/530)
Cheers!
And Thanks a lot everybody for all the fantastic input!!