Trying to locate your prostate with something other than a finger can really be a guessing game. Without that tactile feedback to know where you are exactly it can feel like trying to pick a lock with a paperclip.
This toy is not too small or too long or anything like that. I'm mostly concerned with the shape. Going from the anus to the prostate is not a straight line, obviously. Of course it can be done, but what ends up happening is, if you let go of the toy or even loosen your grip for a second, it will end up flipping around and angling the head away from where it should be, and getting it back into position can be challenging since you don't really know what way it's facing unless you take it out and look at it.
Once you get it right it feels heavenly. The dial works and the vibration is very quiet, even on the highest setting when it's really strong. I just feel like the toy is difficult to use by yourself.