Chartered one in the Med a very long time ago. Not an exceptional performer under sail, but adequate. Needed a fair bit of puff to get it going. Doddle to park under power.
Ask Snapdragon Assoc. as they have Mirage also in the Assoc. They can help with all sorts if you don't mind the wait for them to wake up that someones actually knocking on the door !!
Was very happy with mine, good quality build and I have never seen an osmotic Thames Marine boat (but I have not seen them all). The mirage was excellent in heavy weather.