Myself I do not change keyboards very often and 5 or 6 years being my past limits. I spend time with any new purchase and tweak it to make it my own preferences, but it has to be initially acceptable out of the box. I recently had an experience of buying a new board which as stated above had to go.

My present boards were PSR3000 + Korg Pa50 both excellent boards and both value for money. We attended a seven night keyboard festival recently and I was interested in the Pa800. In between the seven nights evening concerts I spent all seven nights on the Pa800 with my own reference headphones in quiet conditions on Korg display stand. By the end of the week I had decided that this was my next purchase by part-exing the 3K & Pa50.
The Pa800 was delivered 12 days later and I obtained that sinking about making the right choice and feeling to find that it did not sound the way as I remembered it, and again in the same conditions on my own reference headphones.
Just how much more can one do before a purchase. Even the low priced Pa50 inspired me to want to play it every day. The only true way is to have a keyboard at home for 2 to 3 days, only then can one be sure of its true potential

Anyone considering the Pa800 don't be put off with my remarks above, it is good value, it has a lot of option, it's well made and will possibly sound good to your ears...it's all personal.

The only explanation is my ears must have decided to go on holiday after the seven nights keyboard festival...