I have a kronosX 88 which I got after problems with two original ones.
You simply can't compare them keybed wise. Both my originals had uneven spacing, my X every single key is perfectly spaced.
I have zero problems with velocities on it and its a great synth.
With regards to the fan, most people have no problem, but its not a matter of what different people deem acceptable, some Kronos do have a louder fan.
I can hear my X one occasionally when I boot the Kronos, but it goes quiet after about 20 secs, I never heard my original ones at all.
I also have a PC running Cubase and Native Instruments nearby and the fan noise of that drowns out the Kronos completely. If I shut down the PC I can hear a quiet whirl of the fan, no louder than a quiet laptop fan, certainly not loud enough to bother me or get picked up by my cheap Shure PG58 mic, but my Kronos isn't in a studio situation, its in the corner of one of my downstairs rooms, it could well be that if I was in a soundproof studio it would sound a lot louder.
Its also automatically controlled by the Kronos like a CPU fan is in a PC so depending on what your Kronos is doing will depend on how fast the fan will spin.
If your using it at home, I personally wouldn't worry about it, my old Roland D70 LCD screen used to hum louder than my Kronos fan.
If your using it in a very quiet studio location I still wouldn't let that stop you buying what is the best synth by miles. You could be unlucky and get one with a loud fan (if so simply get it fixed by Korg) but the chances are yours will be perfect.
In fact on my original Kronos, I used it for a week, was browsing this forum, read a thread about the fan and panicked as I hadn't heard mine at all and was worried it wasn't working, putting my ear to the Kronos I could hear it so panic over.
Build quality, its fine. The front bar could be a bit better on the 88 version, the design not being what I would call perfect for such a span, but it does the job fine regardless of what I think.
You won't have that worry on the 61 version and most don't even think of it on the 88 either.
The rest is perfect, the buttons all feel great and press fine first time, sliders and knobs the same, all fine. No problems at all.
I'm a very very critical person when it comes to me spending money, I expect to get what I paid for. I did have problems with my two originals that I found unacceptable, virtually any other product I can think of I would have told the company to sod off and I would have bought a competitors product. The fact I have a Kronos X and I absolutely love it speaks volumes.
Get one, I'm sure you will think it to be the best decision you have made in years.
There have been a few of us ranting on here I have been one of the most vocal, and what we experienced, well we shouldn't have. But if you add up all the complaints about the Kronos in the last 6 months by different people, I suspect you will struggle to find 10 and that's from many different countries, so while those with problems have been justifiably vocal about them, they are still a very small number and usually when Kronos problems are discussed on other English forums, the cases people quote are the few on this forum.
So in short, go and buy it
