Good if you're willing to do the agent's job yourself
It's a really good price to get your property advertised on the major online websites, Agreed.co.uk is easy to use a well.
However, I thought their customer service was a bit slow, very often I don't get a reply until the next day, but I was expecting a quick response within an hour, or at least same day.
They had some problem with their site as well, I have made the payment and my property was ready to be advertised on Rightmove/Zoopla, it said they need to verify first, and will take no longer than 2 or 3 days (I can't remember how many days exactly now). I was waiting anxiously, as I wanted my property to be advertised asap, but it was never on Rightmove/Zoopla. After the x days as I was told, I contacted them through their online chat, they told me they never got the notification! Anyway, wasted about 2 days, and it was finally advertised on Rightmove/Zoopla.
Unfortunately for me, I didn't get that many interests through. I was with Agreed for about a month, but didn't get as many viewings as I'd hoped. I found a property I really wanted to buy, but my offer was rejected due to I wasn't ready to proceed, so I had to change to a traditional estate agent, before they even put my property on the market, they've already arranged more viewings in the 3 days I've been with them, compare to the 1 month I've been with Agreed. Offer received on the 4th day with the traditional estate agent, and I have accepted it.
Overall, I do like Agreed, as you're getting your property on the market for a fraction of what you would be paying the estate agent, but it's a passive approach, waiting for buyers to contact you. I would only recommend this if you're willing to do all the work yourself. In my case, I was unfortunate to sell my property when the mini budget happened, I guess that was the main reason I wasn't getting my interests in my property.