It is a very good student horn, I learned how to play on one!
The 606MR has a rose brass bell, which means that it has a higher resistance to corrosion. The red brass also gives it a different tonal sound.
The 606MR is a beautiful horn that can be used in almost ANY band playing situation. I have been playing for 4 years now with over 25 bands and I would rather play the 606MR than a Bach Strad (A pro level Trumpet)