We had MASSIVE problems with this , specifically macs & the WIFI chips and R500 /510
we updated all macs to the latest os & then the rucus to the latest firmwares.
turned off 2.4 and now we can roam over 3 floors.
We found that sometimes the macs WILL NOT let go of a distant AP, they fight to maintain the shitty signal even if a new ap is closer, so you might be stuck tied to a 50% sig and there is a 97% sitting over u.
cleaning out all the stupid "remembered" connections in the mac control panel goes a long way to helping.
it seems more of an issue with badly placed wifi points.
Then you get the nonsense with "dual points" where the mac swaps between 2.4 & 5 depending on how it feels, seems swapping frequency AND AP does not cleanly maintain the connection.
then there is the issue of "sleep", if you are in a meeting room and tied to a WIFI & sleep, tehn come out of the room and relocate AP's... the mac just swallows packets, turning the wifi on/off fixes it.
oh and YES .. symbols in the names WILL affect the mac, mac follows the RFC exactly.
strange chars, may not pass the unicode values correctly "_-#$@" etc
you will see the same with naming macs & DNS/ DHCP names.