Sorry if I'm off topic here.
I was looking to get a Sony IM10 if it would provide a service beyond that of the NETGEAR PTV3000, but it seems worse as described here..
I have a NETGEAR PTV3000 and use it with an XPERIA M (C1905) which has an Adreno 305 GPU.
PTV3000 Firmware: v2.4.26 (latest as of 19/01/2014)
XPERIA M has a 480x854 pixel 4" screen (FWVGA).
Phone has good 5GHz WiFi signal with PTV3000 box not more than four metres away.
I use a Logitech USB K800 keyboard and M950 mouse.
I am testing with a DELL U2410 24" Full-HD IPS monitor, but have also used a Sony Bravia 40" HDTV (Sans Full-HD)
Images do look better on the Sony Bravia 40" HDTV screen compared to the Full-HD WUXGA (1920x1200) monitor resolution.
I have a 720p mp4 video with 2ch audio, we use to test Android phone builds and it can be seen to be very slightly 'choppy', however the audio track is maintained through the video. The image is still watchable, but you perceive it to be ever so slightly unnatural.
Watched another video with following format:
Video: MKV H.264 25fps 720x576(HW acc)
Audio: AC3 (44.1KHz) 6 ch
The video was watchable, but there was a very sight frame drop, which is noticeable throughtout the video.
Streamed some .flac encoded music at 1.4Mbps using Neutron Music Player from my NAS
Using Sennheiser headphones plugged into my DELL monitor 3.5mm output port, music sounds very good
No skip, loss of sound, breakup or anything.
If I edit a OfficeSuite Pro MSword document, there is a noticeable lag in typing, but it's not a problem with a keyboard.
Mouse pointer action doesn't feel very natural and speeding it up and/or slowing it down didn't find a natural sweet spot.
Mouse is still quite usable, but not quite natural with pointer motion.
On a 24" IPS Full-HD monitor, pictures and images are viewable, with quality maintained for large images and upscaled for low quality images.
The screen icons look like someone draw them in with a child's colouring in crayon.
I am not sure if this is a FWVGA screen being upscaled to a WUXGA (1920x1200) monitor resolution, or if it's the PTV3000 downgrading the image, I would suggest is the monitor upscaling low res images in the case of Android screen icons.
"swishing" through screens was not a problem and no pixelation or artifacts during transition.
Youtube videos are quite watchable, but some seem to have a lag.
On my PC the same videos had the same lag as my XPERIA M.
So one may have to be careful as to how much lag is introduced by the Internet and not Miracast
No freezes or audio stop/start noted over an hour of testing different scenarios with the NETGERA PTV3000.
So in summary I would suggest the NETGEAR PTV3000 has a slight edge over the Sony IM10 as described by @troed
on an XPERIA M
The one area that the NETGEAR PTV3000 does appear to preform considerably better as described here, is streaming audio.