I have one of the Fleischmann BR03.10 streamlined 4-6-2 locos. Came with a factory installed sound decoder (ZIMO). Bought it several years ago.
As with most Fleischmann locos, it is a tender-driven loco (the loco itself is a free-rolling dummy, only picking up track power. The decoder and sugar-cube speaker in an enclosure are installed in the loco. I like it. The sound is good, and the motor control is also very good (as with all ZIMO decoders).
As I mentioned, this loco is several years old. Not sure if Fleischmann still uses ZIMO decoders for factory installations.
I run my trains on NTRAK layouts and the only problem with the loco was the extra large track gaps between some NTRAK modules. When it was pullign a high-drag passenger train, when the driven wheels in the tender woudl fall in the track gaps, the loco would just slip in place. But that is not a fault of the model, but of sloppy trackwork.