I have been using Mobbin for 2 years and don't regret paying premium tier for it! Up-to-date screens of apps help me a lot to find inspiration when building designs and keep up with current trends!
When they do have what I'm looking for, it's pretty good. Filters are extensive.
Though, I did not find what I'm looking for all the time. Which is a shame.
But the idea is amazing and useful once in a while.