USB card reader: "just works" or not ?

[Vincent Trouilliez]

Hi,

I am going to need an internal USB card reader, to read SD cards,
something like that:

http://www.ldlc.com/fiche/PB00072490.html

Are these kind of devices "just work", or are there some readers that
don't work on Linux ? If so, where can I find a "white list". 
The problem is that there are no technical details about these products,
so it's impossible to know what chip/controller they use...

Presently I have a old (eternal not internal) card reader, which works
perfectly, but I don't if it was just good luck or not !

--
Vince