I purchased a similar locking butt-plug from eBay. I believe it cost me about $50. This one has a button you press, that expands it, once inside. Well, it is almost impossible to press the button, by yourself, with enough force to expand it.
That is with the rubber O' ring around it, and a condom over it. It's much easier with out the condom, but then you risk pinching yourself, on the inside
I have noticed, there are mainly 2 types of these. The ones with the button, and the one where you turn it to expand it. Making it somewhat adjustable. The one I purchased with the button, gives you only one choice, fully expanded! And it sort of "snaps" open, when you get it to a certain point
It's quite a feeling, when it snaps open fully... Takes your breath away, for a few seconds!
Then if you never used one before, it can be quite a interesting experience!
It hurts a little at first,
But after a few minutes, it's not so bad
. Put that padlock on right away, before your bottom changes his mind. Because it is heavy. At least mine is. Walking around will be a little difficult at first...
But you will get used to it, if your master holds the key
I too, thought it would be a great combination to go with my locking steel chastity cage. That's what I call it anyway.
But that if far from the truth. I think I would enjoy having one or the other, not both at the same time. As like someone said, it leaves the master with nothing to play with.
On the other hand, having both your cock and ass locked, could be fun, under certain circumstances...
Without a master to dominate me at the moment. I was able to get mine fully expanded and locked by myself once.
After that, I had to make a device, (from a steering wheel puller) to provide enough force on the button to expand it myself.
Then getting if out is another story...
I had to use a metal ruler, to use as a wedge, to pry the thing open, or un-expand it, to remove it by myself.
It was a little scary, as I could not get it to close, and remove it, as easily as I thought...
I have since realized, I should of bought the other one, with the adjustable expansion.
But It was more money.
I would recommend that you buy the adjustable one, as it seems much easier to remove.
But my overall experience, with the one I purchased, is good.
Not something for everyday use, but could be a good punishment, if you've been bad.
I only wish I had a master, that would lock up my ass, for "special" occasions...