Presumably you have other visible deterrents? I had one, along with a disk lock steering wheel lock.
It depends what you want it to do really. I suppose it would stop the more sophisticated remote key cloning or whatever it is, but won’t stop someone coming in to get the keys, or rather they’d have to come back in for the code (speaking from experience…)
I didn’t have any electrical issues after the original install but after it was returned the occasional off/on again was needed, and I’m convinced it was the garage that ‘repaired’ it.
It’s a minor inconvenience when you’re using the car each day, but for the sake of a few hundred pounds it could give some peace of mind.