Use - With curiosity, I bought this from Thomann and I received on time as promised. I didn't play trumpet for more than 5 years, my lips get easily tired after 20-30 minutes practice, so I tried the magic of this Lip tonic. It was a good feeling, very relaxing on the lips. After I applied the lip tonic, I couldn't play well because It was slippery for my mouthpiece.
Pros - cheap and helpful for the lips
COns - None
You could try and experience the feeling. I would say for the price, it is fine.