If it is comfortable and plays well for you its good.
Spots Weril, of Sao Paulo, Brazil, make really good quality brass instruments at very reasonable prices. My Weril Regium cornet is of comparable quality to instruments that cost more than twice as much. My best suggestion is that you find a brass specialist in your region, and go and try our the second hand instruments to find one that suits you.
for the price yes, but they are certainly better quality
Not especially. It might get the job done for marching band, but definitely not for concert settings.
Trombone are different for everyone so I recommend you go to a band shop and just try out their trombone and see what brand you like best.
No. It's cheaply made Chinese garbage. For your own sake, never buy from Palatino. If you have the money, look for a Shire or Edwards. Bach and Conn are good as well, so is Yamaha.
It's fine, if it's getting hung up on a wall at Chili's. It could also be a passable beater horn for marching band. For anything beyond that, then no.
Trombone mouthpieces vary in price depending on what they are made of and brand. Prices can range between $20.00 and $225.00 for basic mouthpieces. The least expensive units are made of brass.
Maybach is a Stencil name and they get their instruments from many sources. Some play quite well, while others don't play at all. If you are considering a Maybach trombone, it is critical that you try it before you buy it. Don't ever buy any off brand instrument online, ever. You must play it first to know if it is good or not.
Trombone is trombone in Italian.
The price depends on the model. Simply asking by brand is like asking how much for a Ford car.
The Nirschl Euphoniums made after 2009 were made in Brazil at the Weril Brass factory and yes, they are good euphoniums. They are well made and built heavy for a nice dark sound like the old English made Besson horns. I would not recommend the Nirschls that were initially made in India. The latest Nirschls made in Brazil were well thought out, designed and engineered in Indiana and Germany.