Hi
I'm also considering a Nespresso machine. I have tasted some of the varities they offer and I have also been impressed. The cons are that it is easy to use, you can store the coffe capsules for a long period of time and hence offer guest different kinds of coffe, it is simple and easy to use etc.
I do have an espresso machine at the moment and I never use it. The main reason is that I feel that the result vary from time to time (due to my lack of skills of course) and due to the fact that I have to clean it after I'm done. So I would be more than happy to pay a bit extra for a cup of coffee from a Nespresso machine. It is way cheaper than buying it from the local coffee shop at least :-)