Definitely worth it I'd say. For the small outlay/cost, if they're helping to protect my engine, then it's gotta be all good.
Id go for the Mfactory set have them on my own car. Real good strong magnet on them
M factory sell the mega powerfull magnet ones, i have a set, i woudlnt call a mahnetic sump plug essential but it cant hurt and easy to fit when your changing fluids so i would reccomend them,