I have to admit, my first impressions of the server weren't all that great, because I was wondering what made the server a custom OT. However, since I've been playing OTs for more than a decade, I know much better than to judge a server based off first impressions. It took three shots, but I finally began enjoying the server.
I didn't, and still don't like the fact that there are no custom vocations (as far as I can tell), and no custom spells (again, as far as I can tell). No spell library on the website, and no spell command, and haven't found my way to a spellbook as of yet. Either way, if you've played tibia, you should have no problem playing this server.
Besides the custom map, and a couple of custom item uses, like the luminous orb, I fail to see what's in-depth custom about this OT. However, that aside, it actually is a great server. It's fun to play, not tooo fast to level but still fairly quick. Its map is expansive and can be very confusing (for example, I was in a mino cave once and the next floor down were 2 dragons, no warning of any sort).
No custom spells, vocs, monsters, weapons, equipment, and etc, all that aside, it's a great server. Again, this is just a beginner's perspective, but I feel like if the "custom" of the custom server isn't slapping me across the face by the time I hit level 19, it's not very custom, besides its wonderful map, of course.