What do you want to know? I've only been there a couple of times, but I'm probably going again saturday in a week. It's easily the biggest club around, especially if you count the garden. I've never been to Paradise (Stuttgart) and Artemis, both of which might have a larger inside area, but small outdoor areas.

World has both an inside and an outside pool, a quiet sleep cafe downstairs and a busier dance cafe upstairs. Draft Beer is included, food not as good as it used to be (but miles better than Oase). They seem pretty strict on the FKK dress code, I haven't seen many hip thingies. In the weekends there are off course a lot of girls (well over a hundred two weeks ago), but I hear it is a lot quieter on weekdays. Atmosphere is always good, but for some reason I usually have better sessions at Oase. Not to say there aren't many girls who provide excellent service, I just find it easier to weed out the 'bad' ones in Oase. Mostly Romanian girls by the way, just as in Oase. Enough good looking girls as well.

Girls often hunt for clients and some of them don't know when they are being turned down and keep coming. Like most big clubs, there can be waiting times for rooms at busier times, but nothing like the 1 hour+ waiting you can have at GT, LR and PHG. In the summer you also have the benefit of the Garden in this aspect.

The pricing is similar to the rest of hessen (50 half an hour, 65 entrance). If you buy a 5 or 10 entrance discount card (which can also be shared, in case you're traveling with a buddy) you have a deal where you can visit Mainhattan and World on the same day (which counts as a single visit). So if you're staying in Frankfurt, you can go to World during the day - drive back around midnight -  and have a few beers till 5 am in Mainhattan.

All in all, I would say it's a must see place if you're into the whole FKK thing. Just the size alone, with the multiple numbered parkinglots and a garden the size of a couple of football flieds, makes it special.