Polaron did eventually install the solar system, but the project as a whole was poorly managed, poorly communicated and stressful as a result.
They do not provide a dedicated contact/project manager, so you'll end up dealing with countless different contacts. Getting our system accurately quoted was a battle, as a random polaron person who had no idea about what you'd agreed to with someone else would put together some slightly off proposal for me to sign. Phone tag, emails would ensue.
Post installation support is unfortunately proving to be just as poor. I've been trying for two weeks to work with them to get the EMA device online. (It reports on the output of your solar, fills in cloud dashboard and accessible from app) They've just scheduled a call with me to resolve the EMA issue, so we'll see how that goes.
If I could do it again, I'd choose a different vendor/installer.
Update: Polaron reached out to ensure my system was up and running. The EMA issue was resolved. I still would absolutely not use them again, and would choose a different installer. Dealbreaker is: no single point of contact. The people I started working with dropped off the face of the planet part way through the setup. Unless they institute a project manager and single point of contact for the whole process, just walk away.