I know it has been a while since this topic has seen a post, but I recently picked up a couple of the AP-2000iq generators. A friend of mine (several actually) have sets of the Honda Eu's. I did a close side by side comparison.
The AP2000iq model is able to be paralleled with a cable that runs $59 bucks from Amazon (or costco online). Unfortunately, the cable has a funky twist style connector for the female end...unless I am missing something, I will have to make an adapter.
The Honda is only minimally quieter at no load with the eco setting engaged. Hard to say actually quieter, but the Honda appears to have a slightly lower idle. However, at load (eco throttle deactivated) the smarter tools seems to be slightly quieter. Overall for about $800 savings over a pair of Honda's I gave them a shot. Same specs as the Honda's. Inside is a complete Yamaha built MZ80 motor. Not as cute as the Honda's but then neither am I!!!
With Costco's return policy, you can't go wrong.