playon is awesome. I use it with my PS3 daily. However, my PS3 died last weekend and I have started using the Wii.
First, load the internet browser onto the SD card, this helps increase the amount of buffer room you have.
Second, remember that the Wii is wifi only so you need to optimize your network for sending large amounts of streaming data across over the air.
Third, make sure you are using component cables for video quality.
Finally, the Wii isnt super powerful so dont expect it to output anything above 480p. since it is streaming video; the source, if hd, should look sharp, but it will not be 720p.
All in all, i'm impressed with what playon has done with the wii. the GUI is nice and the connections work well. You get more control with the Wii also then with the PS3. Both have pros and cons.
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