I've written about this before elsewhere, and all I can say is YES, I HIGHLY RECOMMEND GETTING ONE! Rather than rewrite what I've said before I'm just going to paraphrase myself-
I recommend a crystal Fleshlight (but not the smaller "Torque model", those are made for smaller guys) and it's worth the high price. It's superior to jerking it (but not to actual pussy, of course) and I like watching my big dick fucking it since it's clear. The textures do awesome things to my cock. I'm average girth so I opted for the butt orifice, which is nice and tight, however you should get the pussy or mouth orifice to accommodate girth over 6", the crap this thing is made of is wonderfully stretchy. If I ram my dick in there as far as it will go, I get just passed the Fleshlight Logo. The swirly chamber at the end is to die for, especially if I just swirl it left and right, letting the texture pleasure me like nothing else can. If you look at this diagram, you can see that chamber starts at the 7" mark.
You have to add some length based on the orifice. For me, the butt adds about .5" of insertable length, so it swallows up 8.5" inches of cock if I jam that fucker in there all the way. I'm 8.5" measured bone pressed, so that's how I know. If you get the lady insert, you can easily add an inch of insertable length and it will comfortably take 9", no problem. If you jam it in all the way, you would probably hit the cap, but if you remove that, it will take all of you.
Remember to use lots of water-based lube in it and on yourself for the best results, and always wash it out after use. The FleshWash they sell is perfect and it keeps your toy sanitary and like new.