Immediately made an account when I saw this thread. http://www.ffxi-crystalline.net/
Crystalline has been around on Sylph since, well, quite frankly, i'de say near launch of the NA version of FFXI, if i'm not mistaken. Course, don't quote me on that. My point is, it's a very old shell, and has survived for a very long time. I definantly encourage any RPers to take a look. Definantly a great shell. Great people. There's usually at least half a dozen, if not more, people online at most times. Usually alot more during certain times of the day. I won't ramble on to much here, but you can hop over and check out the forums. I myself have only been a member of the shell for about a year, but I can vouch for the fact that almost every day I was online, there was something going on RP-wise, whether it was something big or something small.
It's a very friendly atmosphere, and the linkshell itself is considered IC 100% of the time. From my own personal experience, if you're a hardcore roleplayer looking for a Linkshell, Crystalline definantly will not disappoint. It's a very tightly-knit community, and a very open and welcoming one as well.
If you have any questions though, i'de be happy to answer them, as would anyone over on the Crystalline forums.