Do a search and you will get some good feedback.
Like most other things it doesn't hurt to try and, if done right, can be very satisfying. Other than with specialized practitioners, like Micaela (probably spelled wrong), it may also be a YMMV thing. I think the staff at Changs are quite skilled. They know what they are doing and where the prostate is, as opposed just sticking a finger up your ass. It can add to stimulation on release but really is massaging a sensitive part of your body and you feel it for quite a while afterward. Go for it.