Are expensive beauty devices effective as a substitute for a dermatologist?

So many beauty devices are coming out these days, you know 😵‍💫

High frequency, ultrasound, galvanic, and even LED...

There are so many varieties and the prices are quite steep, so I'm hesitant to buy it easily.

✔️ Did you really feel the effects of the beauty device?

✔️ I'm also curious if there is a big difference compared to dermatology procedures.

✔️ I also want to know if using it consistently helps with skin elasticity or lifting.

especially A device suitable for using alone at home I want to get some recommendations,

A product suitable for sensitive/sagging skin I'm curious what it is.

and How many weeks do I need to use it to feel the effects? No!

If anyone has actually used this, please share your honest experiences.

I'm worried that if I buy an expensive device for no reason, it will just end up as a decorative item... 😭😅