Great Keyboard Overall
I've had a few weeks to spend with my MOX8 now and feel fairly qualified to provide a review. I really like the sounds and think the AWM2 sound engine has a lot going for it (the success and ubiquity of the MOTIF series is a testament to that). Love the arpeggiator, the mic input for Vocoder feature, the Favorites builder, the feel of the keyboard, and everything you get for the price. This is going to be my good friend for my studio, for live gigs and for composing.
The keyboard is light and easy to carry and yet has a great weighted action. The controllers, knobs and switches are well laid out and the command and menu structure are reasonably intuitive. You get the slim Owner's Manual inside the box and the rest of the manuals are in PDF format on an included DVD. I ended up printing the extra materials out because I want to really study and tweak this beast.
The wall-wart power supply, however, is cheesy and unworthy and will require some care and attention to make sure it doesn't break off and do damage. I'd have been happy to pay a little more for a keyboard with the power supply inside, even if that would also add weight and cost; maybe heat was also a YAMAHA's concern with the molded plastic case.
I'm a Logic Pro 9 user. YAMAHA doesn't offer as much integration with Logic for the MOX8 as it does for Cubase. If you're a Logic user, you will want to understand MSB, LSB and other elements of MIDI to tweak your Logic Environment to work with this instrument.
One warning: The supplied MIDI drivers, which are also needed for USB connection, are for Intel Macs only! YAMAHA does not make this clear with their marketing literature or documentation (including online in their Downloads areas). I'm using a Mac G5 PowerPC, and spent days trying different drivers, scratching my head and poring over the manuals and online conversations only to finally contact YAMAHA Support. They got right back to me -- wonderful support -- and told me I need an Intel Mac to use the USB connection. Ouch!! Guess I'll have to get myself a newer Mac. It's old-school MIDI for now.
YAMAHA is currently offering a free gig bag for purchases of the keyboard through October '12. I got one and it's nice: soft-shell but well-padded with wheels on one end.
Overall, this is a serious and fine instrument and probably unmatchable at its price-point.