...no, it is not (as long as you do not add water). But it is not a great sherry maturation either - I call this an average modern-style sherried whisky with some flaws and off-notes (cheesy, vegetative, minor sulphurous). It is okayish to drink but I do not ask for a second dram, to be honest...
The colour is russetmuscat and the nose shows a modern sherry profile with some cheesy notes but no sulphur - hooray! Oops, no hooray - after some breathing whiffs of sulphur enfold, so sad. No, this is not an appealing sherried nose (to me) but it is not really bad either. I simply like the old style sherry maturations more than these new ones that obviously are produced using "designed" casks (bodegas rush sherry cask seasoning to meet the increasing demand of the distilleries).
The taste is better on bold modern sherry flavours but the Glenrothes malt can cope with that and the barley sugars hold their head up. It is greatly chewable with more chocolatey and fruity-nutty flavours joining in as well as some autumn-floral notes from the malt. It gets a little bitter towards the finish (the heavy tannins of the designed casks take their toll) and yes, there is a minor sulphurous note in-between but this is not annoying.
The dram arrives warming and nicely coating on the palate without distracting moments. The finish is long and turns more bitter with tea-tobacco-sulphurous notes but it never gets unpleasantly. Towards the very end a tasty flash of dark chocolate flavours pops up that is very interesting. Water releases stronger sulphurous notes (matches) so if you are a hell boy (or girl) add some - otherwise stay with the neat dram...