Let me start with the good stuff. While I have seen cartoon sites with more content, HentaiXXXSex does have quite a bit of toon action, including 51 picture galleries and 36 video feed sites. Actually, that's one of the problems. While there are 36 links in the toon video section, not all of them actually have videos. Some of them are picture galleries and some are little flash games. I would say about 15-20 of them are video links, which still isn't bad. The other good thing about the content is that although the videos are all feeds and therefore not downloadable, the quality of the stuff I saw was pretty good. Finally, I should mention all the non-toon extra content, which consists of about 1,000 picture galleries, 20 bonus reality sites and 350 video feeds.
As for the problems, as I mentioned before, nothing is downloadable (that includes all the extra content). For a site with the word Hentai in the name the majority of the toon content isn't Hentai. Instead, there's a decent mix of all types of comic drawing styles (for some this might actually be a positive thing). However, if you don't mind not being able to download anything then maybe this huge mix of toon and real porn is what you are looking for and therefore might be worth the money.
