I've long heard complaints about the GlenDronach Cask Strength series taking a step back. That's probably partly because of the "Good Old Days Syndrome", but maybe there's some truth to it as well.
When it comes to sherry matured whisky, Glendronach has been the brand to beat for quite some time now. One of their successes is the Glendronach 18 Years Old Allardice.