Hey @Tommy Harper
Full disclosure: I work for Carrot. I also have Carrot website and primarily focus on SEO.
I'll start by saying that Carrot isn't for everyone (and that's okay). But we are proud of what we have built.
Hopefully, you can find some more Carrot customers (or non-customers) to share their experiences. But just wanted to hit on a couple of things to help you with your research.
We view SEO as 3 distinct and critical parts (each with its deeper nuance)
1. Speed
2. SEO
3. Conversion
Speed
Carrot has invested quite a bit of money in our servers to be lighting fast and also in our websites doing some complicated stuff to ensure your website loads for users (computer and mobile) because Google has made that clear in terms of ranking a website. An example of this would be loading the first view (form) and loading stuff as a user decides to go down the page. You can use a tool like https://pagespeed.web.dev/ to check out the page speed of some Carrot websites and our competitors. Speed will slow down the more tracking codes and big images your stuff on your site. We've published some speed tests on our blog and Carrot usually performs at the top.
One alternative is self-hosting which can give you speed but usually comes with a dedicated server and those are costly (I know because I host personal non-RE blogs on them). Talking thousands of dollars a year.
SEO
SEO can be complex - but we try to give you a leg up by giving you pages that are SEO optimized and inter-linked when you create a site. Of course, you can optimize from there based on your market and real estate strategy. I know of a couple customers who are doing really well with some niche situations like selling a house in retirement. We have no shortage of content and guidance in our platform to help you figure out the work that is required with SEO. But make no mistake, you will either need to roll up your sleeves or outsource the work. But we try our best to guide you along the way and not make the website a stumbling block for having awesome SEO.
Conversion
You asked about SEO but Google can tell when a website has quality content and a user converts on the website. We focus heavily on split testing to ensure our websites have the best-performing elements. I common mistake we see is having a really big complicated form that a user doesn't want to fill out. We keep ours front and center and simple with a clever 2 step process. This increases conversion. Another mistake we often see is websites that don't consider a mobile user and how they would interact with a site. We take a lot of time and care into testing and thinking about those things so you don't have to.
*Final thoughts*
Carrot is a tool. The more time/money you spend to get good with the tool the more results you can achieve with it. In terms of SEO, if you Google "sell my house fast" + any market in the US you will likely find a handful of Carrot websites in the top 1-5 spots. In fact, I know several markets that #1, #2, #3 are all Carrot websites for a bunch of competitive keywords. So the results somewhat speak for themselves. But don't want to oversell the fact that SEO takes time, money and experience. So just make sure you know what you want from your website performance.
Happy to answer any other questions.