I'm in the process of buying new midi controllers for live and studio. I notice that this two controllers are in the same price range nowaday. We all know that the A70 has more features and functionality and upgradability. But what makes the A33 be still in the same below $500 range, while the A70 goes down to the same range. Is there something wrong with the A70? Or, the A33 has gain more respect in terms of its semi-weighted keyboard feel. I know that the A33 keyboard does not have aftertouch. Anybody here who had a direct interaction to this two controllers, sales guy or musicians, shed me some light.