Pro: it's faster than electrum, especially if you have a long wallet history with plenty of transactions (spent or unspent)
Con: I've heard it doesn't like unexpected shutdowns, like power outage.
More info if you want a deep dive:
Anybody have experience with Fulcrum Electrum server?
https://apps.umbrel.com/app/fulcrum
nostr:note1nscku745h37vjpesawx43h87z6xz7xrc384a7dxhgllt3qc9hyzs6u4eel
Discussion
Its index is so f'n fragile. If it gets corrupted by a power outage, you have to do the long reindexing from scratch.
Absolutely need a UPS for whatever machine it's on and automated nightly backups.
I got a UPS for nostr:npub1getal6ykt05fsz5nqu4uld09nfj3y3qxmv8crys4aeut53unfvlqr80nfm hub which kept breaking after one of our regular village power outages.