I've heard several times that these budget instruments are only 5%-10% less than professional models, and I'd have to say that the 902SL is actually better than my previous professional euphonium (Sterling Virtuoso 1065HGS) in several ways. Well worth the money.
Pros:
-Light, easy to hold
-Quick, smooth valves
-Intonation is good
-Very, very pretty instrument
Cons:
-The sound is a little bright, but nothing edgy
-The finish is a bit uneven at points but wear does not show due to the satin finish
I have recommended this instrument to many others and some of my euph friends have bought it. It's overall a very nice instrument, and Thomann has great customer service, even overseas.