They just launched it last week. I’m transitioning over this month. But other people on Nostr have done it already and said it works great. I don’t think they will accept checks just yet. I’d keep a fiat back account right now For that. Deposit then as soon as it clears, transfer it over to nostr:npub1ex7mdykw786qxvmtuls208uyxmn0hse95rfwsarvfde5yg6wy7jq6qvyt9