The SP4-7 is new enough that not many will have tried it. All I know is that mine was manufactured in '99 and is still going strong. Quality control isn't something I've had any negative experience with, but this is my first Kurzweil. There's really no middle ground, and unfortunately, few people have actually used one to their fullest potential, if at all. The thing with Kurzweil is you either love or hate 'em.
Kurzweils aren't rubbish, they just aren't for everybody. I couldn't do that on the Yamaha, but then again the Yamaha had some piano voices that blew the Kurz out of the water - but obviously piano isn't in my primary use model, otherwise I would have stuck with the Yammy. Play a little heavier and you get a brassy sound coming through.
Play in mezzo and you get a good, all-around string sound. Very touch responsive - play Horn & Flute W/Strings lightly and you get a breathy string ensemble. Some of my favorites are Dynamic Orchestra, Touch Orchestra, Huge Brass and Horn & Flute With Strings. My favorite thing about my Kurzweil is how the programs (or patches, voices, whatever you call them) are made up of about 10 different sounds, which can be added to, deleted or otherwise edited in the Edit menu, which gives many of the orchestral programs a very dynamic sound. If you're a tweeker, get a Korg or a Moog or something. If you want a good digital piano, get a Roland, Yamaha or Kawai. If you play in pit orchestras and often cover string and brass ensembles like I do, the Kurzweil is excellent. I think that your opinion of Kurzweil will vary depending on your use of the instrument. Yamaha's string and brass sections seemed so flat and uninspiring.
Don't get me wrong, I'm a huge Yamaha fan, but I remember having to layer/split/velocity edit like four string and horn voices (while eating up nearly all the polyphony) just to get a good, responsive orchestral patch that was only almost as good as the presets that my Kurz has by default (Dynamic Orchestra if anyone's interested). The S90's pianos were better, and the action was excellent, but Kurzweil's orchestral suite runs circles around that of the Yamaha. Though there are some things that I miss about the S90, you're not gonna catch me selling the Kurzweil to buy it back.
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