I have tested this server (l2c1.ru 10x), let me share my experience with it.
1. Poor english support. (site in russian, forum in russian with a small english section, game teleport names in russian, I used a lot of translator to get in game)
2. Low server availability. (yesterday I was unable to log in)
3. Roll back. (a couple of hours, it happened a few nimutes ago, it made me quit)