The alien is good as a novelty item. But in my opinion does not give as much pleasure as the STU does. I think the more constant contact and the bumps of the STU provide more pleasure all around the dick. hahaha
Although I haven't used the Alien yet I have used a bunch of other Fleshlights, including the STU and the STU is still my favorite overall. It really has the perfect texture and tightness compared to everything else
Although I haven't tried the STU yet, and it looks like the tightness and texture would be pretty sweet, the variety of the internal texture of the Alien makes me lean in that direction. Either way I'm sure it will be enjoyed.