What kind of look are you going for? personally, my pressed hair always looked smoother, straighter and healthier than my relaxed hair. amazingly my relaxed hair looked more poofy and dry in straight styles. the biggest drawback to pressing is that all that heat is damaging, therefore you tend to press only once or twice a month, meaning you end up washing less, hence your hair doesnt recieve the moisture that it needs cause you try to avoid wetting it or using water based products to maintain the straightness. also not being able to wash often may cause your scalp to be uncomfortable and your hair gets dirty.
So since you dont like the "nappy" look...if your able to put up with washing less, pressing every two weeks is a good option. But...if you like to wash your hair more often you may be better off getting a mild relaxer and wet seting.
I like pressing because its temporary and i can wash it out and wear my natural hairstyles.