I also have the MAESTRI ELECTRIC TACKER - 71 SERIES
I have used the ELECTRIC DUO-FAST STAPLE GUN 50 SERIES in the past
Both Electric guns work well and do a good job. I have used both types shown on the above link. While not as powerful as the air stapler, they provide enough power for most upholster applications. Once in a while the larger body of the electric stapler will be harder to fit into some tight areas, but that isn't a problem very often.
Here is another web page showing upholster staple guns:
the Air Staple Gun BEA Brand Short Nose has a 1" nose and is also very similar to my regular air gun.
The "Rainco Air Staple Gun Long Nose" has a 2" nose. While I've never used a gun with a 2" nose, it seems like it would occasionally be quite useful, especially when stapling down into the deep crevices in some antiques. since I only occasionally have that need, I use a regular tack hammer to put tack into those deep crevices.
I mainly use an air stapler, connected to an air compressor with an air tank. Air staplers are lighter, smaller, and more powerful than the electric stapler. But you need to have an air compressor that will supply 90 to 110 lbs of pressure to the stapler.
I must give you a a note of caution when purchasing air staple guns. A good quality gun will be more expensive the the cheap guns. However, if you will be doing very much upholstery, I would strongly suggest that you buy a good quality gun, such as in the links above. I mainly purchase either a Rainco or Fasco gun, but others (such as a Senco) will also work well. Besides the quality, one of the main differences between a cheap air gun and a good quality gun is that the good quality guns will be a LOT smaller than the inexpensive guns. The smaller size of the good quality guns is very useful when getting into some of the tight corners of upholstered furniture.