React for 2/3 years, Vue for 1 year building large SASS apps. I use Svelte for my personal site and really enjoyed it, but dismissed it as a contender for my companies latest application. It's community is still too young, there's not enough established, battle-tested libraries for common tasks like routing. It reminds me of React in the early days, I felt overwhelmed with choice and a constant feeling the 3rd party library you are about to go all in with will be shortly replaced with a better, community backed alternative.

I'd love to re-visit that in a couple of years time when it's popularity and community has risen and is more established. Just as React did.