I've been wondering about these myself. There is a "del sol" thread here where they are used but have not tried it myself.
I might pick up a set since they are so cheap but I have been leaning to more expensive drivers only because the "build" part of DIY takes me some time. I've only got 3 builds in so far and 2 unfinished .....cause they sound good

....and I don't want to take them out to garage and finish them.
That last 10% is the killer.
As long as I am putting in the time for construction of the boxes, a driver that has been simmed, built, reviewed, graphed and commented on here is what i look at.
I'm thinking of ordering some Markaudio drivers, so as long as I'm paying for shipping a set of these do not really add too much to the cost.