OK, so I had this blog post waiting around for me to finish. At the ITF in Austin I wanted to try playing some mid-priced trombones.
Clear advantage: Eastman.
What about quality? Well, I've heard people blast both brands at times. Others say they've had no trouble. YMMV
By the way, as far as I know, Andreas Eastman doesn't exist. Fictitious name.
If this is true, seems a little tacky.
Still I suppose it would sell more products than a name like, say, Ignaz Gooberfeltzer.