I initially got the Nuke firm as the shape, diameter, and length was exactly what I wanted for deeper stretching. I eventually got the Nuke in not firm later, which led led to this review.
Upon getting it and trying it out, it quickly became apparent that my anatomy couldn't adapt to this thing due to how blunt the head shape is.
I have many toys of the same or slightly larger diameter, and have little issue with them after warm-up, but this thing is just too blunt and too firm to be used. It ended up just hurting my tailbone, instead.
So I thought perhaps the regular Nuke would work better, and upon receiving it, it was clearly softer, so I had more optimism.
Aside from getting it in only a few times after a great deal of work and effort, it remains ultimately just way too blunt to be useful or fun. Still hurts the tailbone, too.
I would imagine that the H Bomb head shape on the end of this toy would be much better and would be still a serious challenge with the Nuke's diameter, but both of the ones I have are sadly just in the "flop" bin now.