Erik the nominal voltage of these Lithium-Ion packs is 7.4 volts and when they are fully charged they settle around 8.4 volts which is too high for most current radio gear. You need the regulators to drop the voltage down to 5.5-6.0 volts to keep the radio gear happy.

Yes I use the regulated reliaswitch and am very happy with it, it's nice to only have to use one component instead of two. Of course you can run standard switches if you like but in that situation I would opt to run two packs just in case a switch dies from vibration the other will be there to back it up. Either way works, I just like to keep it simple.