Make sure you use locktight on the nuts holding the spacers on.
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Just that within a day or two of fitting mine, I started to get a noise from one of the front wheels that sounded like a wheel bearing breaking up. On closer inspection I noticed that the nuts holding the spacer onto the hub had started to work loose so I applied some locktight and torqued them up tight and then repeated the process for the remaining 3 wheels and haven't had a problem since.
Thats good to know
I thought they just bolted on using your existing nuts i surpose you bolt them to the existing disc and your wheel then will only bolt on to the spacer and not the disc ?? It would worry me they could come off though, hence the lock tite.