Sign-up is a huge barrier to people trying it out, especially given that there are high-quality alternatives without that roadblock. For me personally the loginwall is enough for me to not use it.
But I do appreciate them telling me about the competition, so that I can use them.
Versus tatiyants we think the main advantages are if you have a lot of operations in a query plan, or if you need some help working out what to do to speed it up.
If you come across either of those, it'd be great to hear what you think.