Glenfiddich 12yr is one of the best entry level scotch but this, 15yr, for this price difference definitely a best buy in every category. Whoever wants great dram for 37e - there are only few alternatives to Glenfiddich 15yr. If you want to dig deeper into scotch whisky, definitely go for 12, 15 and 18 yr (would recommend 21yr as well, but it's a bit pricy) - tasting experience that Glenfiddich provide with core range of its product can not be beaten.
Of course, if you are looking for more complex and/or peaty stuff - skip.
Summary - 15yr is best bang for bucks for a daily sipper. Period. For most people, 12/15/18 core range is a must entry into world of non-peated scotch whisky. BUT - if you remove "price" component, there are many more better 15yr scotch whiskys but they are going for 2x/3x/..x the price
