Hang on... as a former IIgs guy (yes, I loved it, but liked my ST's better), I need to chime in on the old argument about pricing and bang-for-your-buck. The IIgs might have been listed as having a $999 starting price, but you have to remember that Apple only sold you a CPU. If you wanted ANYTHING to go with it (monitor, disk drives, or even a keyboard & mouse), you had to pay separately for it.
Everyone I knew that had the typical IIgs setup with an AppleColor RGB monitor, one 3.5" 800K FDD, one 5.25" 140K FDD, basic ADB keyboard, ADB mouse and 256K, 512K or 1.25MB (depending on when you bought it) paid $2,300 for their system and that didn't even include a crappy Imagewriter II printer, a SCSI card or even an internal fan (yes, the fan was extra/optional).
If someone spent $2,300 on an Amiga or Mega STE at that time, the IIgs would only have its sound hardware to fall back on and, as previously mentioned, because of the processor Apple used, the 8-bit bus and lack of software support, even the Ensoniq chip was crippled.
I need some help on something... I had always thought that the Ensoniq chip was 32 voices, 4 channels. I know that the IIgs' bus couldn't support that, so they paired the oscillators and made 16 voices, one of which was reserved for the system beep (what a waste), giving it 15 usable Wavetable voices for synthesis, with the IIgs' mono output. So... was the chip stereo, or quadrophonic?
Another thing to consider; the IIgs' expansion slots were tied to the built-in hardware's functionality, so if you wanted to use bus cards, you had to go into the Control Panel and turn hardware off. It went like this...
Slot #0: for RAM expansion only
Slot #1: Serial printer port
Slot #2: Serial MoDem port
Slot #3: Apple ][/][+ 80 column card (most people ran their IIgs in IIe mode w/Extended 80 column support, so people often put their accelerator here)
Slot #4: Mouse card slot (also not used in IIgs mode)
Slot #5: 3.5" FDD
Slot #6: 5.25: FDD
Slot #7: Auxiliary slot, anything goes (usually a SCSI card)
So if you wanted to use say, slot #2 for an internal MoDem, you have to turn off the second serial port on the back, rendering it useless. If you decided to put your MoDem in slot #1 instead, it'd cost you your built-in printer port, etc.
The IIgs was a great idea, but it should have been a platform unto itself. The backward compatibility was both its saving grace, as well as its downfall. Like 64 mode on a C=128. They had to build in backward compatibility to make it attractive, or no one would buy the blasted things. On the other hand,, nobody programmed IIgs or C=128 software, because they could just release an Apple ][ or C=64 version, knowing that it would run on the newer machines. Catch 22.
Anyhow, that's what I have to throw out there right now... I've owned a IIgs, several ST's and a few Amigas (along with countless other machines) in my time and loved them all. I just found the IIgs' quirks... interesting!