I got the largest one which is still an ok large size but not challenging for more experience size queens. The flex is something I wish was more rigid so it makes aiming against it and dropping on it hard will get it to go inside you easily is not cause possible. The head is a bit soft. The ribbing shaft they look like it will vibrate your ass as it work it in-and-out but it turns out to be less sensational unless you curl it against the side of your opening and 'see saw' against the ridge of your opening.
And at about 9" long, it will get to your sigmoid curve leading to yoru colon for sure. For those looking for that filled snesation of something widening your rectum and pushing against your sigmoid curve and just peaking into your colon when you totally sit on it or banging it hard to the entire length, this is a pretty good one to help you get to the climax or get you excited to take your next bigger toys to go all the way in to the colon. Not for the faint of heart.
For it's price it is a decent buy. But watch out for the wear or melt. It will not tolerate silicon lube for sure and somehow it was pressed against my other dildo toy.. one from King Dick.. for some reason, it almost FUSED together at the base of the suction. When I pry it apart, it distorted and took a while to normalize but it also show sign of melting of the surface like some un-wet paint. So now it has a melted mask. My KING DICK dildo was fine.
Suction is pretty strong, so if you can hump this hard against the wall and take the full length, it should give you a lot of fun.