Unless the giving partner already possesses almost too much girth for receiving partner to be comfortable with, the only reason you shouldn't get this in the case of some sort of allergy or if you desperately have to pay your rent to stay dry.
I paid for the expedited shipping, and even though the tracker claimed that the fat boy would arrive later than it was supposed to, it ended up coming on time. (Which was an awesome surprise, so log in and check on your package daily)
I had to check at least once on all of the four days I waited, Simply due to excitement, and I was not disappointed.
Choose your size, either 5.5 inch, 7-9, or above with great care. I am packing a little over what I thought would work for the 5.5, and I was worried about growing too big for the smallest size, once I purchase a hydropump.
My advice would be that the 5.5 could probably take a litte more than it claims, if it's anything like the 7-9 one I have. Even though I have room to grow, it would probably easy to fill it out and reach the tip for people such as myself. I think the goal with these would be to go for size that you know you can meet comfortably, that way, the sleave wont dwarf you so much in comparison.
Be prepared for how thick this thing is. It's claimed to be the thickest of these kind of sheaths, and it was actually more than I was expecting. Even after watching the video and seeing the 5.5 model, I was amazed at the 7-9 I got. As long as it's not too much for anyone involved, this is a super exciting addition to the collection.