My first two batches (mr beer fermenter) have had a beery aftertaste (used discarded Muntons Ale yeast from a couple of kits I bought online). I did notice that the longer you age, the more apple flavor you get. I did pick up a packet of Redstar Montrachet to make my next batch. My thinking was the ale yeast wouldn't dry out as much, leaving some sweetness behind. That explains the beery taste, I am still aging some to see if it improves. The base recipe has won awards, that's what I am trying next (should have started there, I know).