Hi all,
so now i decided to get much better in real life tennis and i am thinking about buying a tennis ball machine. Here is the one, that caught my eye:
http://www.lobsterinc.com/products/el05%20le.htm
It is quite expensive, but as i read the reviews it makes a great workout and you can program the drills as you like. And i am aware, that coaching is important too, but tennis ball machine complements and is cheaper in longer time span. They even offer a 2 year warranty.