FistBang is a nonexclusive content site, which means that you may come across the same content on almost any other fisting site. At least there aren't too many fisting sites out there, so exclusivity may not be a huge concern.
Out of 15 picture sets available here, only a few galleries feature fisting scenes. The other galleries have fingering, dildos and insertions as well as totally unrelated material. However, the picture sets I saw were of excellent quality.
There are over 33 video feed sites available here but they have no fisting movies. While the over 37 sites you get as a bonuses sound exciting, don't expect the quality to be much better than on this site.
In general, this site is kind of pricey and not of the best quality in terms of fisting action. We can't give the site our seal of approval, unless you only go for the trial membership.