I guess John C. is closest to the mark but allow me to digress.
First of all you have to realize we are talking about a 199 dollar keyboard here !!! See e.g. Guitar Center. Though it has all the trimmings of a fullfledged arranger obviously many corners have been cut.
A comparison with the Korg Micro Arranger springs to mind , after all as I mentioned I still have the Korg PA50 which in essence is the KMA with full length keys.
So what does a 199 dollar arranger keyboard add to my current set up with Ketron SD9 and Korg PA50sd. Basically it is all about sounds because the Style department while many ( approx. 200 on this cheap PSR) lags significantly in comparison to e.g. the KMA, which sports many good styles with four variations.
Soundwise this cheap yamaha beats the KMA and similar Korgs in quite a few areas, noticably the more percussive sounds sucha as piano, elec. piano, ac. guitars, vibraphone and even in the organ and electric guitar department. (note that the KMA is at last twice the price if not triple and has small keys).
What does it add you may well ask in comparison to the Ketron flagship the SD9.?
Not all that much but it does in some areas , in particular the electric pianos, organs and the stringpads (which by the way are excellent in the KMA). It boasts over 600 sounds , a fair number of effects (progammable) and alas only 9 Registration spots. the internal amplification of this PSR373 is superior to that of the KMA.
One minus is that it has Midi via USB so if you do want to hook it up to your major keyboard ( but why would you want to) you could purchase the Kenton MIDI to USB host convertor, but it is rather pricey.
So summing up, incredible value for money , especially if you have NO Yamaha gear in the house. Concert piano is incredible for the price, many other good sounds some of them from the earlier Tyros models, 5 octaves, fullsized keys, good amplification, lightweight ( 4,5 kilos), can be battery operated, etc.etc.
In 2010 I briefly owned a PSR3000 and in the song here in the link I used some of the el. piano sounds that you can also find in abundance in this 200 dollar keyboard !!!
https://app.box.com/s/l8r7d1tf8r9k7ma8e8i1dl2hy3bkoa0oregards,
John
P.S. I was even luckier to get the PSR as a slightly used secondhand with full waranty for 150 euros.....go figure !!!!