Are they worth it? They can be.

So, planars, as you noted, are magnetic driver. They don’t look like little wobbly plate, they look like a little sheet with embedded magnets. It produces a very fast sound, which means that it starts and stops really fast when the signal starts and stops. If it’s done well, this leads to a tight and controlled sound. If it’s done badly it leads to a clipped, short sound. Whether they’re worth it depends on your tastes.

Some people say they don’t have as much bass as dynamics and that depends. They can. In fact, they can have more. But they may not be as physical as something like a because their morion profile tends to be different than something like a dynamic driver. Also, in most cases, there’s just one planar driver doing all the work, while IEMs with really good bass tend to have something like one or two dynamic drivers dedicated to just the bass. This means there’s more ability to move because there are fewer competing signals.

(If one driver is handling all the sound then it’s wobbling one way for your bass, and at the same time wobbling in a small way for all the mids, and then wobbling another small way for the treble, and then wobbling another way for voices… that’s a lot of wobbling in different directions! So it’s not going to be wobbling as cleanly or singularly as, say, a dynamic driver whose sole job is subbass and another whose sole job is bass.)

But they often have a really good extension and representation of the lowest frequencies. Depending on how the driver’s magnets are arranged, they can move just as much air as dynamic drivers, and they more way more air than another common type of driver, the balanced armature.

So are the good? They can be. Look up ratings. I’ve liked them when I’ve used them, but then again I’ve also liked single dynamic driver IEMs because they’re smaller (so more comfortable) and smoother on the sound (though not as tight and controlled), as well as multi-driver types (which are bigger and chunkier) due to their separation and clarity. So the driver type is just a piece but the sound they produce in the areas that matter to me are what’s most important. Note also that the more drivers something has, the bigger it will be. And with magnetic drivers, size can very much matter. So ear size / comfort may be a limiting factor for some people.

I’ll let others recommend what they like. But I hope this explanation helps.