There may have been other factors that were considered. For instance, the PSR-S670 is a little bit expensive-- not along the lines of the PSR-S975 or Genos, but not exactly "throw-away change." If the PSR-S670 were bought on a whim to pursue an old dream from younger days, but then other demands popped up, it may have been preferable to return the PSR-S670 for a refund to help pay for those other demands. I'm not saying that was the case-- I do not know what the case was-- but in my experience it's easy to overlook any defects when you really want something very much ("warts and all," as the saying goes), and just as easy to latch onto and magnify any defects when you aren't sure whether you really want something as much as you had thought you did.
Pretty much all valid points...except for two,that I do not entirely agree with...one,being that the S670 being expensive.Secondly...the key-bed being a defect.Among the well-seasoned,keyboard enthusiasts that know the market well,the S670 is the bargain of a lifetime.Having been a previous owner of keyboards such as the MOX6(which was $400 more than the PSR-S670)....I can honestly assert that the MOX-series is considerably deficient in terms of features and audio quality,in contrast the PSR-S670.
As for the "defective" keybed...well...unweighted synth action keys not being perfectly level,is not a defect...but a common trait of budget keyboards that most of the time,do not effect the quality of a performance and is something most people overlook.
Perhaps...as you've mentioned,Jimmy may have had other obligations or specific features that required more money...but obsessing over something as innocuous as inconsequential imperfections of a key-bed and to the point of seeking help on a forum because of it(& perhaps using this excuse to mask the real reason behind the return)...is just so silly to me.
In my findings over the years,I have found one thing to ring universally true,which is that regardless of how much a company offers for anhy given price,people always find room to complain about something(rather than just appreciating the attributes of a value-based product.)
Okay...I get it...e-v-e-r-y-o-n-e is seduced by the prospect of saving money and getting the very most out of any given price...however though,I cannot get over what an amazing keyboard this is!
Given the sheer majesty of the S670's features,versatility,screen size,expandability,voice quality and what seems to be full size keys,how can anyone have any complaints at this price point??
Maybe it's a millennial thing,because when you grow up in the 70's and 80's,you appreciate e-v-e-r-y-t-h-i-n-g that you get for your money.