**An update a year later (June 2013).. these are great unless there are gale-force winds. Repeated smashing against the house is not good and I've had to replace 2. Part of it is there is no telling what stress the glass had on it before and it seems to have a history so, part house smashing, part hidden stress. Overall though, very enjoyable. I think the next design will require some tweaking, as my rock tumbler gets testy when it has too much glass to tumble! Man, these rock stars...divas! LOL
Ended up taking off the CD/wind catcher and that seems to have calmed things down a bit, as the slightest breeze set things in motion. I'd use that again though, just on a less fragile chime material.