Funny thing is when I started reading this post I was going to post that same exact switch. Great quality build. Down side is it really isn't 6 input... it only has 5 SCART inputs. Using two of these hooked into to two different SCART inputs on your TV would work great (if you have 2 SCART inputs on your TV).
If you don't have 2 inputs though I really don't advise running two boxes to a third box... that would drop quality across all consoles. What'd I'd do (and is what I used to do before I bought my new TV) is make a daisy chain and have the consoles you are less concerned about on the end...
So you'd plug the consoles you don't care about into one box, then output that to a second box and use one of its inputs for the first box, and the other ports for the consoles you do want better quality from. Then send this second box to the TV. When you want to use consoles off of the first box you will hit the button on box 2 for the first box, and then hit the button on the first box for your console.
[EDIT] If you have the money though you should look into seeing if zektor makes SCART switches. I know they do RGB, Component, DVI and VGA switches up to 6 port... and they are of amazing quality using relays to swap between inputs which reduces noise in the picture.
The big problem with looking for switches that can handle a lot of inputs and have a high quality picture. Because the market is so small (who are the consumers looking for 10 way switches... a few retro gamers, stores, other professional applications that are very limited). They just don't make them very often, and rarely with high quality components.