After having piano lessons for a couple of months, I knew I wanted to play piano for many more months to follow. When most of your practice is done outside of your lessons, it's important to have a real piano, or as close as! As a student I was on a budget but didn't want to limit myself too much as it would be an investment for at least the next 5 years.
For myself, the most important thing it needed to have were weighted keys. After reading quite a few reviews and even testing out the SP170s I felt it gave me as close to real a piano as I could get for my budget. The keys respond very well to your pressure, and although palsticky in feeling, I didn't feel that my fingers slipped across the keys. My only criticism about the weighted keys, is that no matter how little pressure I apply, it will always make a sound, which is not the case with a real piano.
The integrated music stand works great and allows about 4 pages of sheet music to be displayed at a time. The speakers give a full and rich sound and do go to quite a high volume. I mostly use the piano with headphones as I don't want to upset the neighbours - there are two 3.5mm head jacks on the back for dual listening if there are two players. The sustain pedal works flawlessly and is very compact. The piano comes with several other sounds effects, but these are really just for a bit of fun.
My only criticism of the piano is that when I unplug my headphones the speakers don't always kick in, but I believe this to be an issue with my unit and not across the board.
When coupled with a stand and stool, it makes a great beginner's piano and doesn't take up very much room. I will definitely be upgrading in years to come and there is nothing like a real piano, but I will be keeping this one if ever I want to do any performances as it is [reasonably] portable.