Let me offer a different viewpoint.
Redfin absolutely serves a purpose, but in some markets, notably for my case very hot markets, it's a significant impediment. I really wanted redfin to work, shopping in seattle 2 years ago. I tried for almost a year, but they would consistently be not as contactable or prompt as we wanted, and gave us very erroneous advice when it came to crafting offers on some houses we wanted. As a result we lost out on houses when we could have been competitive.
Eventually we got a very solid realtor, who was aggressive in finding us houses that would slip through our normal searches (the house we ended up buying had been on the market for a long time at a higher price than they eventually relisted it for, in an area we had discounted.) When a bidding war started, he worked with us by being connected with the selling agent, gave us very accurate hints on how we'd need to push and what would work to our advantage, and landed both the deal and some back and forth that happened after.
Downside, this was after 2 years of searching and losing out on houses I frankly today still regret not getting. An hour+ commute sucks, and I attribute some of my early failures to not getting an experienced/knowledgeable/active realtor earlier.
YMMV but that's the caveat from my experience.