I bought my panels from Signature Solar. I received a good price and good service, and I would rate my experience a 10 out of 10.
Many good points have been made in this thread. DIY Solar is not for everyone. There are nuances that require many hours to learn. It also requires a lot of research. I would have thoroughly researched the inverter manufacturer including their support channel. Did Signature Solar state in their quote or sales order that they included FREE solar engineering and technical support?
You definitely get what you pay for. I didn't call my distributor for support for TIgo and Sol-Ark. I called them. Did Signature Solar drop the ball in this case? Yeah, probably. The truth probably lies somewhere in the middle.
People are 10 times more likely to post a bad experience than a good one. I understand why the original poster is upset, but isn't some of the blame on him for buying cheap products and not doing his homework first?
Also, I see Ben is on here doing everything in his power to remedy this. I consider them a reputable business, not perfect but reputable.