Even though Ryanair has given us the dimensions of the cabin luggage that we should adhere to but I am always amazed at some of the luggage that goes in to the cabin.  We purchased our bags from a very well known TV shopping channel because they have been designed so they can be put under the seat in front of you but the length of the case is a lot shorter than Ryanair's size but the depth is a little bit bigger.
We haven’t been stopped yet but I am wondering whether anyone has had their cabin luggage refused or knows of this?  

Or am I panicking about nothing?