Aerogarden questions

So I decided that I really wanted to grow but wanted to do it the cheapest way possible. I looked at the aerogarden and it seems really nice and easy for a first grow, but I have a few questions about it. Are the lights on the aerogarden hood good enough or should I replace them? What strain is the best to grow in it? I have heard Big bud is the best but I am not sure. Can the aerogarden support the plant all the way till you harvest it or should you just start it out there then move to a bigger system? How many plants can fit in one aerogarden?