Asura.Antihero said:
I have Sch to 90 but it's hardly my main job. That being said I enjoy playing it and can see it's usefulness in a lot of scenarios. If you want to get a viewpoint on sch by someone that did a lot of testing back a few years ago visit this link: Kanican - Scholar Guide It's a few years dated since he doesn't play anymore but it gives you a good idea of how potentially strong the job is.
Kaeko is a legend, he pulled near impossible things (soloing a salvage area on sch at 75) before others even thought about it (or was the first to describe them to such a level, whatever). if you want to get a deeper understanding of the jobs mechanics and its possibilities read his blog.
I only have sch to subjob level as of right now as Im mainly a blm when it comes to mage jobs but I consider taking it up too at one point.
just wanted to add that, read kanican, its worth it