very good, with little weaknesses.

I use the BD 8509 now has more than four weeks of this device is my 2.BD player and 3.Twin receiver. Purchase decisive reduction of two devices (BD player and twin receiver) was a and thus the reduction of various connection cables with all its pitfalls.
Here is my conclusion:
The BD 8509 can be, according to the basic functions set good use, the remote control and menu navigation are no Rätzel on.
The image quality is very good, though I could not see any difference to my previously used Topfield 7750.
The boot time of just a few seconds, the switching time around one second.
As a really positive, I feel that one device (despite running fan) do not listen. Even when the TV has no sound, no comparison to my Topfield 7750, or Playstation III, which possibly go with a completely different sound level to work.
It can formats via USB or the internal hard drive plays all popular music, picture and video. USB look pure and pictures or listen to music! So far, all CDs, DVDs and BDs used by me have been played.
All necessary interfaces exist (no Scart, but which is already obsolete in such a device).
Using the remote control can be controlled by appropriate programming of the TV, making another remote control unnecessary. Also I find very pleasant. The HDMI output can even be programmed to start at the TV automatically (I use a Toshiba) with on and off. More comfort is not going well.
The manual operation of the internal sensor keys is problem. Only the absence of Skip "buttons I find annoying, this remote control must be used.
In the recorded TV data it is not possible to put an index, to look at this point to a later date.
The iTunes Store, use the matching (free) app, making it possible to the device via the iPod touch or iPhone control. Also works perfectly, though it's just a gimmick dispensable.
Incomprehensible is why no information is displayed about the current program when switching to another program. This was my old Kathrein five years ago better. Information may be obtained only via the Info 'button. Possibly there are here a software update that resolves this weakness.
The device via Wi-Fi to my home network went smoothly.
I have supplemented the BD 8509 by the AV Receiver D 700 from the same manufacturer, with which I am also very satisfied. Visually a beautiful combination for a small price.

All in all a great device, reasonable processes and good to use with some weaknesses in detail. Nevertheless, the best I ever had.
I would buy it to me again. For all undecided: A strong buy recommendation, a star deduction for these weaknesses.