i didn't read every response closely, but one thing to note about the aeropress is that if you follow the paper instructions that come with the box, you will not enjoy it to its full potential. i only just recently learned this. buy one, immediately throw away the instructions, and google "inverted method"
in fact, here,
i'll do it for youthere is absolutely ZERO bitterness using the method in that video. pure coffee awesomeness (obviously the quality of your bean and your grind are still a huge factor). i haven't tried the metal filter, but the paper ones work fine for me - maybe someone can comment on the difference
french press takes too long for every day coffee, and the aeropress inverted method is significantly better than drip coffee if you're dealing with the same quality bean/roast. compared to a keurig, it'll be like moving from mcdonalds burger to a BGE steak