With regular repetitions, the weight of the master keyboard was his main argument (approx. 15 kg). It's actually the little brother of Roland A90 (EX if the card is installed VERD-1) with the same functionality (I had the A90 before, but 27 kg it hurts!).
Differences: 76 keys and keypad light.
RARE MIDI specification for a 76-key: twelve o'clock inépendantes 8 ZONES, splitables together on the keyboard. Otherwise, almost everything is done by noon today is (it is missing the ribbon controller, but it did not yet exist).

UTILIZATION

Nice touch for a keyboard light, not immitation piano but a slight resistance that can assay a little better.
Synthesizer very easy to use, system sub-menus with easy shortcuts and double click on some buttons for regular computer. Many buttons and knobs are adjustable (but in general, not piece by piece), each zone has a button to be enabled or disabled at any time or to switch to solo.

OVERALL OPINION

I used the A70 for 2 years (up there soon). I tried before the A90 and the OBERHEIM MC2000. The sharpest of the three is OBERHEIM (everything parameter for each piece) but the simplest and most AS LIGHT is the A70. With the card VERD-1, you will have some more piano sounds and derivatives that are for me among the best on the market today. Making the studio for 9 years, with the A70 and PROTEUS 2000 SAMPLER ACCESS VIRUS and A3000 was a good compromise for me not too heavy. Today I have a new blend (which costs more and sounds more electro): KORG TRITON LE-76 with extended sampling + NORD LEAD 3 (7 kg + 6 kg).

Hoping to help other keyboardists who have back pain!