Quite frankly, I do not see the point for medium format backs, who can be removed and where the CCD is easy to access to be dusted with a blower.
As to the sticky cube on a stick, I bought a similar system years ago. It is called "SpeckGrabber" from Kinetronics. I used it once and found out it left greasy marks where it removed the dust specks. It cost me another trip to the photo shop and a wet clean kit. I never used it since.
Since that time, I exclusively use a hand blower, shown below. I find it does the job just fine.
The only drawback is that it looks like a cross between an adult toy and a medical device. But you don't have to show it to your friends.