Wm Maxwell Ltd was created on July 27th of 1990 and the only shareholder is Ian Macleod Distillers Ltd. They were selling a 28yr old version in 2010. Tasting notes from other sites place it as an average malt: citrus & cinnamon aroma and a taste mixture of citrus (orange peel) and caramel. The overall judgement, good impress guests (age of malt) but nothing spectacular for true malt fans.
Sounds like a decent buy if it was at the original price of 29.99 pounds.