Design is good, the sales letter seems pretty good. However, affiliates won't be liking the fact that you're only offering 50% commission. 50% from $27 is not much at all, and I'm not so sure that many affiliates will make some effort promoting. I think raising the commission to 75% will help a lot.
The sale is a $27 monthly subscription so affiliates will clear about $100 from each sale, which is pretty dang good