I talked to Amir Fishelov from Solaredge at SPI, and read the white papers. I'm convinced they are on the right track. The practical disadvantages of a central inverter are unsurmountable and result in serious losses. Putting the tracker with each modules solves that. Partial/temporary shading and underutilization of roof space is a reality. In my neighborhood I see if every day. It's unforgivable that an entire string should shut down or tank due to partial shading. Amir also told me that their power box/MPPT is much less affected by heat than a microinverter (which I'm convinced will succumb to heat within years). If that holds true they've got it solved.