When you say ferment stopped after day 4, are you referring to hydrometer reading or just that the airlock stopped bubbling?
Chances are it's still got a little ways to go.
Cidery tastes/aroma are typically acetaldehyde and common causes include but aren't limited to: Insufficient aeration at pitching yeast, high pitching temperature, low pitch rate for yeast, incomplete fermentation and use of simple sugars such as sucrose and high loads of dextrose. I'd suggest it's too soon to judge how the brew will turn out. Best bet is to kick back with a home brew and relax while the yeast do their thing. It's not born yet, so too soon to count the new baby's fingers and toes.
Note: Acetaldehyde at this stage is the result of incomplete conversion of sugars to ethanol. Give it time.
That said......if you haven't used it before are you sure it's not just the aroma of the Amarillo?
I think you'll find the FWK's made by any of the boards sponsors are unquestionably of the highest standard obtainable. What you do with it afterwards is most likely the source of any flaws.
Martin