About this business of buying the latest and greatest. I've been playing for thirty years this month, and just bought an S710. In this time frame I've owned 5 Yammies, 5 Rolands, 2 Casios (utterly despised both of them) and 3 Kawais.
I didn't buy any of them simply to keep up with the Jones's, but because of the need of the moment. I got some of them simply because I outgrew their capabilities. I bought others because the previous keyboard was not reliable or rugged enough (the Kawais for example). Frankly, with this last purchase,the finish on my old keyboard was aging poorly, it was out of warrantee, I no longer needed an 88, and I wanted the features on the Yamaha PSR S710, which were more like the last Roland I had had.
So far as what I know, all of my Rolands and Yammies (except for one) are still working. In fact, I recently saw a video of my last Roland still going strong in a church in Mexico. By the way, the reasons why I got rid of my last Roland and got a Yammie were because it used a floppy which was being phased out. It took too long to load from the floppy. I could play it, but no one else could and I needed an 88 to replace my Mom's piano which I couldn't play, and was sitting alone and abandonned in a corner (I gave it to my Sister). Honestly, the DGX I bought was a big step down but I needed a keyboard that others could play easily. It was a big step down. Well, I'm very busy playing semi pro now. It was a struggle dragging around the YPG 525. I could not see the display when I played outdoors, It was way too slow loading from the USB stick and I had had some problems with the sound. So, you can see, I don't buy keyboards because they're the latest and greatest, but because I am satisfying the needs of the moment. At the momeant the S710 fits me perfectly. I'm not feeling my Wheaties so much as I am 70 years old now. I only have a small car to transport my keyboard and equipment in. The S710 has all the ports I need, has access to thousands of styles instantaneously, has wonderful sound and exquisite capabilities. I intend to use this keyboard for a long time and I really do love it. Yes, Tyros, Audya, and Korg are marvelous, but none of them meet my needs. I probably should have bought the S910 as the S710 cannot use SA2 voices, but in all other respects is the equal of these other machines and meets my need perfectly.