There is a drawback to it, though...
If you are using 2 tone paging, it can sometimes miss the first tone and fail to alert.
It's a handy option to have, but if you are concerned about missing traffic, you may want to think about it first. I've played with it on NX-410's and it does make the battery last longer, but considering I can have a new battery last me two full 8 hour days at work before needing to be charged, it doesn't really do much in my case. If you -really- need to squeeze as much life out of your battery between charges as you can, then it's a valuable tool.