Hello vbdx66, I bought the PSR-S670 because it was a used one but in a perfect condition for 250€. Honestly, I had no particular complaints about it apart from its appearance maybe that I never liked.
But it was a bit too much for me, as my initial goal was to have a simple, light and inexpensive keyboard that could help me compose and test personal "patterns" in real time thanks to the automatic accompaniment.
At that time, I had a preference for the Yamaha PSR-E363. I was amazed that you can have a great sounding, looking and well built keyboard for less than 200€.
But when I went to the store to buy it, there was the PSR-E453 for 240 € so hardly more expensive so I bought the PSR-E453.
As I ended up using the PSR-S670 very little for lack of time, I decided to sell it (420€) and go back to my first idea, so I bought a used but almost new PSR-E363 for 150€.
I then realized that it was not so convenient to exchange files with the computer because the E363 is not able to save songs as midi file, and it has no USB key input.
There was also some styles found on the PSR-E453 that I missed, so I decided to sell the E363 and buy a used E453 back (180€).
So the most expensive keyboard I bought was the Casio MZ-300 because I bought it new for 300 €. It was that price that decided me to buy it. But I had to return it back to the store because of a bad keybed.
My new CT-X3000 cost me 200€. It's a used one but it is like new, it has not been used more than 10 times by the previous owner. I like the lway it looks.
I love the sounds and the fact that you can edit them and create your own sounds. And I'm starting to understand how it works.
The styles sound more modern than the Yamaha (what I like) but the "fills" often sound strange and not very natural.
I'm going to try to create a personal style inspired by a style from the PSR-E453 using Cakewalk, to see if the process is straightforward.
What I miss is the possibility of recording directly in audio on the device, so I don't know if I will keep it.
I also wait for the PSR-E473, I'm curious to see what new things he will bring...