A friend of mine actually introduced me to these great dice trays, as he had one, and I have a tendency to send dice off the table.
The price is reasonable considering the quality of the product, and the postage from Australia to Europe was not only affordable but fast too.
The tray itself is easily clipped but the clips stay together, and the pattern is great (though by accident I managed to get the same as my friend!).
If you tend to trow dice off the table like me, and want an easily transportable dice tray then this is definitely one to pick up.
I've wanted a dice tray for a while, but the idea of transporting some big, bulky thing kept me from getting one. This thing unsnaps flat, fitting right into my Cthulhu gaming bag, along with my rulebook, notebook, and folder of various bits (modules, notes, props, etc). Putting it together is easy and it looks great. Used it at Free RPG Day and everyone at the table was asking where I got it.