I have my Audya 76 and SD40. I considered the SD7, the SD60, and SD90, but don't need another keyboard, so my module is great for many things. The SD90 is better, but too large for a module for me.
As far as quality is concerned, most people who had problems in the old days, had an Audya4. Much disappointment and frustration, while I felt guilty having a perfect Audya 76, and it still is. With support, I bought my Audya from Frank, and he has gone to bat for me on minor things when he didn't have to. AJ has also been helpful, plus Curt has jumped in as a very knowledgeable and helpful dealer.
The only downside I see is that AJ and the dealers have to put up with the care less attitude of Ketron Italy, but with their support, I wouldn't hesetate for a moment.
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact