Should I buy thus trumpet or not?Need Advice!?

I hear is not good to buy a tr200 or tr300 bach trumpet but i need to buy one for band/and marching band.I saw a excellent bach strad but people suggest not to get it if its silver because it won't last long enough than a gold one.Plus,i heard when you're playing the high notes,it doesn't sound good.Help,now i really need it and my sister doesnt really know anything.