Redfin has been in CA for a while. They tend to serve the lower end of the market, mostly. The problem is that they hire agents that, for the most part, couldn't hack it in a traditional model. Also, the model of using different people for different parts of the transaction doesn't go over so well with more sophisticated buyers in our market and at the end of the day, most consumers here fundamentally understand that Redfin agents have way more clients at a time and they don't get the same level of service.My advice is to contact the other agent's broker. You don't need "evidence" as this is just a chat to let the other broker know their agent is putting the transaction (ad the sellers' customer satisfaction in jeopardy). Secondly, this isn't far, and it doesn't seem right, but I would just suck it up and get it done. If you want to file a pro standards complaint when it's over, you should. But as of right now your #1 priority is protecting your clients' interests.
He's cheap. Either he doesn't see the value in the homes you are showing or he isn't ready to buy.
I turn the tables. I talk to my buyers about my fee ahead of time and we we go to the sellers, I tell them it's a fixed amount and my buyer will make up whatever they don't want to pay and will affect the buyers' negotiating. My experience is that the buyers like how up-front this is.
Zillow...not for values but its easy to compare square footages and bed bath counts of different models in a tract.