Well this has been a HUGE debate between me and a bunch of other douche pickles, but to answer you question. Not much.
You won't loose your automatic detection of network shares.
You will loose the ability to boot diskless machines, BUT, you can also configure your other dhcp server to point to the right location for serving the filesystem for the diskless machines. This is only if your DHCP server is on a linux box and can accept versatile configuration like that. Or if you have ssh access to your wired/wireless router, you can access your appliance based routers dhcp configuration that way also. I suspect it's possible to reconfigure appliance based routers this way, ONLY if it uses embedded linux, I haven't actually tried, but based on my experience it's more than possible.
Other than those two most common functions you will loose the ability to automatically detect IP based phones like the cisco phone that can be used as an orbiter. Any other IP based device that is not a file/storage sharing device will not be automatically detected. But, if obtain some device like this with the intention of using it under lmce, you are mostly likely a slightly more advanced user and can handle the manual configuration of such devices. If all you want is the remote file share ability, and maybe the media director ability, and already have a dhcp server/gateway you are happy with, then I highly recommend disabling DHCP on the lmce box, despite what these green star posters are saying.
That script, I saw also, was in StorageDevice_SambaRadar.sh, it's a pinging for loop. It's only for network shares I believe.