Yes I've been there and yes, it is worth the effort. Just look beyond the obvious trappings of tourism that have hit the area in recent years. The ticket to Tianluokeng Cluster is sold in combination with two other nearby sites: Yuchanglou tulou and Taxia Village, which are also well worth seeing. Ticket was RMB 100 or thereabouts. I'd be careful about one of those Chinese tour groups. I did a trip report on this (Dec 2011, most of which should still be valid) that describes transport options. Search forum for "jiejies fujian adventure." Additionally, Apple Travel in Xiamen (googlable) can provide car/driver and/or guide depending on your preference but it won't be cheap.

If you have the time, an overnight at a Taxia guesthouse or in Hukeng village or Yongding town is recommended vs a daytrip from Xiamen. It's 3+ hours each way by road. Some people like the experience of staying overnight in a tulou but that's not my cup of tea so read up before you commit.