Does anyone have any experience with the Fosi Audio GR70?

I'm looking to upgrade my Fiio K5 Pro with a Topping E50 paired with the Fosi Audio GR70. I've wanted to try a tube amp for a while now. Reception to the GR70 seems mixed. Some people love it while others report it sounds dull and is prone to interference. I'd love to hear about someone else's experience. Thank you!