This stuff is definitely worth it! It's an investment in your gear and all of your musician friends will appreciate you having it. The basic idea is this stuff can be sprayed directly onto electronics to clean them without doing any damage.
I used it on the pots on all my guitars and amps. No more scratchy sounds. You only need to use a really small amount and the nozzle gets into some harder to reach areas. Look up some videos on how to get the best results, it's really simple.
I'd say one bottle will last a couple of years, so I've been sharing this with friends and family that play guitars, basses, keyboards, etc and they've all been really happy. The next time you're making a big order off thomann, make sure you throw this in!