I have been using Stevia (Truvia brand) on and in everything that needs sugar for the last 7-8 months...my wife and I are both trying to lose some weight and get back into shape, and we cut out sugar from our diet. I tried them all, and like you said, most man made sweeteners taste like crap, and leave a horrible aftertaste. I have found the powdered Truvia to not leave any nasty aftertaste in my mouth. I put it on my cereal, oatmeal, in my tea, cookies, etc etc. I really like it. I can't say how it would taste in a hard cider, but I think it would be fine in moderation. Again, it's the ONLY sweetener I like the taste of.
5 gal secondary: Strawberry Mead
1 gallon secondary: Blood orange Mead
1 gallon secondary: Grape Mead
On Tap: Blackberry Blonde Ale
On Tap: Apple/Cherry Hard Cider