Not just Arran, the whole lineup from Douglas Laing is wonderful. Except for Arran Lochranza Reserve, that should not be on the market...
But stuff like the Arran with different cask finishes (Amarone and Cote Roite are particularly good) or the Bothy Cask or Machir Bay or the blended malts like Rock Oyster or Epicurean or Big Peat or all the other stuff they put out like Provenance are really great. No caramel added, no chill filtration, bottled at a minimum of 46%, they are simply great and a good reason to go with smaller, independent bottlers. Plus a lot of their lineup is budget friendly, in addition to being great malts.
Oh, and if you do manage to get a bottle of Arran James MacTaggart 10th Anniversary Edition somehow, it is absolutely sublime. It puts to shame malts that are twice or thrice as expensive.