Our Noosa club purchased one of these (or paul loaned it to us?) and i have had the benefit of practicing with it or a few weeks so thought id write a short review.
1. It looks like a vase and is not an unattractive or bulky piece to have sitting around...looks pretty cool actually
2.Very easy to set up and use although i tend to have it sitting on something just back from the table rather than on the table.
3.It can do chop, topspin and heavy top spin although its not heavy in any of the three in reality but you can certainly tell they are different
4. I have dropped the thing 3 times and its still working so is robust enough ALTHOUGH before it was dropped, the plug where you connect the power came out of its position as i think it was lightly glued in or something. I can not get it back to the spot and have connected it internally so doesnt look as great now. This happened when i puled it out and moved the unit...that was it.
5. You can vary the speed at which the balls come out
6. Does it do the job? HELL YES !!!!

SUMMARY : Its cheap, very easy to use and operate and will have your game, and fitness, improving dramatically in a very short time i can assure you especially with paul's excellent tips. Have no idea on warranty issues but assuming that is ok i wouldnt hesitate to buy one of these instead of a massive ugly bulky and expensive thing