Ok ladies and gents after much deliberation, I finally went ahead and got this amazing tool. I now kick myself for waiting so long. Forget the novice way of taking a picture @ f/22 of the sky or other clear surface in order to see the dust spot or other foreign object on your sensor...and then doing it again and again after you cleaned your sensor to make sure you did get it right. This bad ass tool make ones life sooooo much easier...specially those of you that own a D600 or D800 that have had some oil/dust spots on your sensor. With this tool I was able to clean both my D4 & D7000 in 10 minutes...and I mean my sensor is CLEAN! There is not a single object on my sensors. Forget the cost...you will thank me once you get it.