Is it good to upgrade the crossovers in your speakers?

Parts cost/quality is so subjective, but my advice to you is this.  If you have an itch to get your hands dirty build a new speaker from a kit.  Then you can upgrade all you want to and be involved in every stage of the process. You'll learn a lot more this way and be more satisfied.

Upgrading parts in an existing speaker may or may not lead you where you want to go unless you've already done it several times.  Rather than play with your perfectly nice existing set, I strongly suggest you get a hold of a good 2 way speaker kit from Meniscus or Madisound or even Parts Express and make it 100% yourself.

You can change everything in a crossover but the point is what do you want to achieve. More detail, different character?

The easiest part are the resistors and internal wiring and most likely what you refer as a sweet spot. Capacitors are costly, can bring a very good improvement but can also expose drive units. With wrong inductors it can get a real mess.

I agree with all posts above, leave them in factory form unless you have good experience in parts and building crossovers as not upsetting speakers' voicing.

Leave the poor speakers alone...jmo

It’s only a good idea if you really know what you are doing. Or just want to tinker and maybe learn and see what happens. Otherwise, if you have the right good quality speakers for you to start with, there is no need. The crossover was already designed and integrated by an expert. Also It is most likely that any changes one makes on any well respected speaker model will limit the # of potential buyers if you decide to sell, assuming one is ethical and properly transparent about such things

I'll be contrary here and say go for it. As long as you're not changing values of components you're not going to change voicing to a huge degree. And the best quality parts are only going to improve timbre, natural sound quality. You can always go back to stock if you didn't like changes. Understand exactly what sound qualities you're looking to improve, do your research on parts you plan to upgrade. Get it right and you're speakers will be much improved.