Capturing POI/new cameras on Garmin 660 or Mio C520

[Mojo]

I'm thinking about purchasing either the Garmin 660 or the Mio C520t sat nav (or maybe N60i). If I see a speed camera not on the database, can anyone tell me how easy/quick it is to save details of it on either Sat Nav whilst on the move so I can report it later on?
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TTG 720
Navcore 8.351
Western and Central Europe 2Gb v845.2645
Home 2.7.3.1894

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