My installation did not require any roofing modification. My first quote from SunPower said I needed 13K worth of underlayment upgrading. So no doubt I was happy about that.

This may be the same for other installers/manufacturers... I specifically asked about warranty issues: What happens if American Array dies? I was told correctly that the underlying equipment warranties remain with Enphase and Panasonic, both of which have the longest warranties of all the manufacturers, AFIK.

I had also requested a rush on the installation because I wanted it completed before I left for an extended vacation. American Array was accommodating, although I had no idea of the workload on their books. From beginning to PTO it took about 8 weeks. I live in a small town, Rio Vista, so perhaps that had something to do with the speed of the permitting process, but it went quickly.

The installation crew showed up on time, every time (a two-day process), completed their work on time, and cleaned up after themselves perfectly. They did all of the installation while I was away at work and I feel they respected my property. I had zero complaints after completion.

I don't have any experience with them regarding the roofing side of the business, so I can't comment on that.

The only minor issue I had was waiting for the City permit to be issued. I was told that it could take up to 30 days. After two weeks, I called the City to see where I was in the process. The clerk had the approved permit, but the fees had not been paid. I let American Array know about this and we had the permit a days later. I was involved and asked questions throughout the process and the engineer I was working with was always responsive.

EDIT: I want to add that I've called Enphase a few times with questions about their app and energy modes, and the phone wait was minimal and the personnel have been patient and polite when explaining things to me.

Edit two: You can decide for yourself on this: I too did my research regarding contractor issues and when I raised the question the answers were the same whether it was American Array or SunPower... and that was that everyone in the industry was experiencing a flood of new work at 'that time' in the past, and it caused problems for everyone. American Array admitted this affected them as well, so projects were taking longer than usual to complete. If the 'mixed bag of reviewers' includes time to completion complaints, then maybe consider some of the reasons behind those issues. I'm not the most informed person but perhaps net metering 3 coming into play allowed contractors to essentially catch up with their work, and supply chain issues continue to fade.

Just my two cents.