There were a few things that went wrong, that weren't entirely their fault, but it was enough to not warrant a perfect rating here. First, when they did the estimate, they failed to notice that as-is, my panel would need an upgrade. Turns out it would cost another $5,000 and 3 months for PG&E to do this, with the other alternative to replace other electric appliances (stove, dryer) with gas. The original estimate was 2 days of work, but it took the entire week (M, T, W, Th, Fri) for them to finish. They tested the A/C and it was working fine, but failed to realize that this disconnected my 6.6kW car charger (where the cable runs directly from the panel and is visible on the outside directly from the panel to the outside of the garage where the charger is), and mistook it for a hot tub switch and disconnected it. I told them I need my car charger, so they moved it to the same switch as the dryer, tested the dryer, and then left. I soon noticed that they never reconnected the air conditioning, and we had to go through a few 90-100 degree days before they got back to me and fixed it. They also accidentally disconnected my solar panels, so I was without solar for a few days. They had to go into the crawl space, and one night I didn't notice until late that they never closed it back up (so at first I was a bit concerned that a racoon could have entered the house this way, since not all the crawlspaces are not perfectly sealed, and we've had racoons once in a while in the back yard.) There was also an incident where they were installing things, and a pipe came loose because it was either not installed properly or not glued. They glued it again and I'm hoping there are no issues, but I haven't inspected their work in the crawlspace to know for sure that there's no leaks or loose pipes (and have taken their word for it). Ultimately everything finally worked a few weeks after the installation, but it was a bit rougher of an installation than I expected.