I use the KF850T recently and I think the sound quality is exceptional. The sound is very defined without being aggressive, bass and lower midrange very present, a medium clear and beautiful and an acute but not garish glitter, of course ... it's better to put out a little of the HP is long-range enclosure.
Admittedly, this is a very heavy and cumbersome pregnant and today there are less imposing equivalent, but it's a very good price / quality ratio used to know to succeed at the game by its low cost.
In my opinion, a very good choice when you do not place too much stress.