I work with someone who is always trying out the latest "thing" in the fitness craze. If there is some new item out for working out, he'll get it. The Bosu ball, kettle bells, P90x, the Insanity DVD's, etc. And slowly be surely, they will all be thrown to the wayside. Is it because they don't work? Of course not. They will all do SOMETHING to improve your fitness, but only if you use them. The problem with all these things is that they are marketed as if they are the one easy thing that will help people to reach their goal of losing weight and looking fit.
What I've learned over the years is that there is not one piece of equipment that is going to provide the easy solution to losing weight that everyone is looking for. Buying equipment is great, but it's only going to work if it's something you like and enjoy working with. I understand the need to try out different stuff. That's where gym memberships really come in handy, because they will generally have a few of everything out there that you can actually try out before making the big decision to purchase.