I was a big fan of the nubby entrance. Overall it reminded me a bit of being deep throated, since the beginning is a large gap (with the almost tongue-like stimulation of the little bits tickling your glans) and the end is much tighter and reminds me of that "yup, that's the back of your throat" sensation. Much like in real life I preferred avoiding going all the way in and just stuck to the shallow sensations.
I tend to stick to my Fleshlight (O'Doyle's Stout) purely since it's quieter, but I'll give it a review soon and have a definitive opinion for you.