I've used Userbrain for years now, and have introduced its use in several companies where I've worked. It's very easy to set up, with good support for screener questions and fast responses from their panel. It's more affordable than other options but still has (nearly!) all the features I need to run quick tests and gain insights. I love the fact that Userbrain will refund you if there are any issues with a particular test. Review collected by and hosted on G2.com.
The AI features can be useful but will often misinterpret whats happening in a test, so can't be completely relied on. I'd love a reels feature BUT the lack of it is by no means a deal breaker for me. I'd also love a way to just add a simple summary note for each tester, that I can see on the dashboard. I sometimes get the feeling that I'm seeing more instances of users not treating the tasks with as much realism as I've come to expect - e.g. some are going through a "review" process or just saying what they think I want to hear, rather than approaching the test as realistically as possible. Review collected by and hosted on G2.com.