Only two features missing from Sparrow that I've been able to find are ability to set feerate on a sweep private key transaction and that a signed psbt from seed signer does not successfully import when using the "open transaction from QR" feature. No one is perfect but it's getting damn close nostr:npub1hea99yd4xt5tjx8jmjvpfz2g5v7nurdqw7ydwst0ww6vw520prnq6fg9v2