I have a web app i've been using regularly and develop regularly with gleam on the frontend and backend. I have written very little of the code by hand and use claude to implement everything, open PRs and stuff and it works well. I like that it's typesafe and you can share code between the frontend and backend so easily, and you don't have to get a bunch of config right like you do if you want an all-typescript application. If I was writing it by hand I think I would find there's an annoying amount of boilerplate, but since ai is writing the code for me it's not a big deal.
Overall, I recommend it.