yes i use dox and update with them pretty often
of course with any "hacked" driver its at own risk type of thing buuuuuut in my case
they work really well....even using instructions to mod those .inif or whatever they are files i could never get official drivers to install on my imac 3.06/8800gs.....thats why i first used dox drivers and they installed right away
but sure enough dox means you can get drivers on a mac fast (tho now it looks like nvidia is actually putting out official laptop card drivers finally) including betas....and they are optomized
how much optomized really means i dont know i havent compared an official driver with a dox driver at the same version.....the only compare i did was with the original bootcamp drivers and with a later version dox driver and using fraps got framerates up from 5 to 10 fps depending on game
so i like them
also dox seems like a really nice guy from the forums and tries to help people out a lot
about heat.....yes it is true that some driver versions give more heat on some hardware than other driver versions..... this is true for official drivers too of course....but i havent had any hardware death or anything from using dox for almost a year i guess
plus i always use smcfancontrol under windows anyway to save my hd from melting so im presuming its all ok
as i say i only used dox on my hardware but for me its worked fantastic