Since I do not have Sky SUBSCRIPTION I can currently receive no HD channels but what rausholt the Humax via integrated upscaler from the normal TV program (576i) looks very good, I have asked the upscaler to 1080i and on my 127 cm plasma TV to see all the stations very well. Also films from USB HDD (DivX) be improved by upscaler, photos and MP3 I have not yet tried out over USB.
The switching times are very short, the program information display (in the bottom of the screen, takes approximately 20% of the screen surface a) is very clear and you can while looking Pro7 cycle through channels such as and sees the Info display immediately what the other programs running and can also directly switch to this, thereby there is no need to call the extra-program guide.
UPDATE July 2010:
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After several months of use, I'm still impressed by this receiver. Meanwhile, ARD HD, ZDF HD and Arte HD are fed into my cable network and the Humax can finally show what he can look :-) The World Cup in HD of course, was a highlight, even if we do not win the World Cup.
So far, only criticism: to stutter from time to time it starts on the SD channels, which is probably the upscaler of Humax. If one is on the button "V-format" to "Automatic", the stutter disappears. But is rare and has to get over.
Update January 2011:
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Still doing the Humax good his service :-) The problem with the film judder on the SD broadcasters has since disappeared, probably in the meantime a new (Onkyo TX-SR 507) was due to the combination with my old AV receiver (Yamaha) has given way.