It depends on the type of campaign and dungeon master you play with. In a West Marches style campaign that is very dangerous (lethal) or in a campaign where the dungeon master doesn't conceal or fudge rolls - it is a fantastic invocation.
If you play in a campaign that doesn't have a lot of combat or a campaign where the dungeon master protects you with plot armor - your mileage may vary and it is probably not a great choice.