Hi Pawel
I have this robot at home and I have used it quite a lot over the past 3-4 years, so can give you some good advice.
Firstly, have realistic expectations about what you can do with a robot. Training with a robot isn't going to make you a world beater, but it can help you improve if you use it
in addition to training with other people. I have used my Robo-Pong 2050 to improve my technique, my footwork and my recovery between shots (it can shoot the balls out pretty fast). As UpSideDownCarl says above, playing with a robot can be fun and is great entertainment if you ever have a party at your house (honestly, people go crazy for it)!
I have written a more in-depth article about the pros and cons of training with a robot. Read it here:
http://www.tabletenniscoach.me.uk/can-a-table-tennis-robot-help-you-improve/
As for the Robo-Pong 2050 itself - it's a decent, well-made product. It has lots of programmed training drills and you can event program your own (although I have never done this, as I just use the pre-set ones). The biggest limitation of the robot is that it can only shoot one type of spin at a time. But you soon adjust to this. I really like the robot and there are loads of footwork drills you'll be able to do with it.
If you have any specific questions about the robot, please feel free to ask (I'm not a sponsored by Newgy or anything like that - I just really like the robot!).
Tom