I’ve been using “filament LED” festoons for a few years, and surprisingly for this kind of stuff, they’ve held up without any problems.
I’ve tried both the cool and warm tints, and the warm white versions do a good job of mimicking a regular bulb, almost indistinguishably.
But if what you’re after is blinding amounts of light, or trying to flood the compartment with whiter light, they’re probably not for you.
The only issue is that whomever decided to copy the longer festoons like the 6411 didn’t read the specs correctly, and interpreted the figures as tip-to-tip, and not contact-to-contact, so they are a bit shorter than they should be, and may not fit some fixtures well.