You can really get sucked into some these "gadgets" if you let yourself. You will just be spending a great deal of money for nothing. I have found a lot of my tools by improvizing. Don't get me wrong, there are certain things that just make the job easier, but do yourself a favor and double think it before spending a lot of money. I agree with the other posters here, and I say there is no replacement for practice, practice, and finally practice. All you need is a icing bag, coupler, a good medium consistency icing and a paper plate.
One of the most important things to remember about using a piping bag is to not fill it too much and make it difficult to handle.
Except when I am using my cake icing tip, I only fill my bags enough to fit in the palm of my hand. This way it's small enough for me to handle, and the bag empties quickly, keeping the heat of my hands (hot-handed mama here) from melting the icing and make it unuseable.
Theresa 
This way it's small enough for me to handle, and the bag empties quickly, keeping the heat of my hands (hot-handed mama here) from melting the icing and make it unuseable.
Theresa
Oh, how I wish I had those 'hot hands' - sometimes I think I could freeze water with my cold hands and feet
I haven't seen or heard of these things, but the first thought that crossed my mind was control. I wonder how easy it is to control the flow, back off when needed and increase/decrease pressure for certain things.
I'd think if it was possible to get that kind of control out of something battery operated, it would be quite a learning curve (for me anyway!)
Youve got to be kidding me was the first thing that crossed my mind when I saw this item in the latest Bed, Bath & Beyond flyer. Next well see them on late night TV, but wait theres more buy now and youll get a Shamwow and Slap Chop for free, just pay additional S & H. ROTFL!!
I completely agree with cabecakes & playingwithsugar, and there is no substitute for a palm sized piping bag of the right consistency icing and practice, practice, practice.
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