Not sure about the lidl ones, but i have the Easycap DC60, which is dirt cheap.
The only problem with them is that the chip inside overheats, and causes audio crackle.
You can take the cover off and let the air at it to cool it a little, but its still a nuisance.
Not much room to fit a heatsink in there also.
I have a tv card in my desktop that i played with for a while, which yielded better results, but the audio went out of sync increasingly with the software i tried.
I use the www.turtlebeach.com stuff - found it had way better reproduction than Creative/Sound Blaster and was way more stable + The card I have had a 'Versa Jack' which was an input/output socket that could be switched to be used as either a line out or line in...
Was really handy for mixing and messing with recording stuff
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