Make sure you use locktight on the nuts holding the spacers on.
Tell me more...
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.
No different to fitting new wheels with new nuts really - need to check after a few days but rather more fiddly to do. Demon Tweeks did my spacers up so tight my local garage struggled to get them off...
that makes a change, i know a few people who have bike tyres fitted there only to find the wheel has come lose 5 miles down the road i had to help one guy on an r6, he didnt even get off the ind estate