You will only find one like mine second hand, but there is a new version which can run a call sequence etc. I think someone on here sells them too.
I don't think it is bad, seems loud to me and the PP3 battery lasts OK. However I seldom just use that, as I swap back and forth from electronic to old fashioned, and therefore I am not sure if the Mini Colibri has ever actually been the key. I do know if I forget my WAM etc. my confidence sinks.