Hello Audrey.
I have worn a plug every day for years and have had very few problems. The plug goes inside the stoma and the wafer fits right on the skin with nothing protruding (just like a plaster would on a wound). The advantages in terms of intimacy are obvious, in that nothing gets in the way. However, there are are other advantages: the plug is made of porous material which lets wind through but not faeces. It has filters, so any farts don't smell and they don't make a noise either. It puts me in mind of me of 'tampons' for stomas.
Whilst I think they are a good idea, I don't use them primarily for these reasons; My rationale is that they help with my parastomal hernia, which would otherwise close my stoma so tight that gas builds up behind and is painful. The plugs keep the channel open for gas to pass easily, but it also holds the stricture open.
On the 'con' side: Just occasionally, the plug used to get pushed out. However, when that happened it didn't push the wafer off but lodged on the inside of the wafer - between the skin and the wafer. This was the same if sometimes there is a small amount of output with it. When this happened, it was not painful, but just a little uncomfortable. Of course, this is a timely reminder telling me that I need to change it for a new one. I managed to stop this happening by sticking a plastic bottle lid over the wafer where the plug is and holding it on with my hernia belt. This gave enough pressure to keep everything in place.
With all these devices, it's best to give them a try to see if they suit you, nothing is lost by experimenting in this way until you find something that works for you.
If you want to know what they look like, there is a photo on my profile.
Best wishes
Bill