i have a failsafe in my monster pirate, it is definitely worth the money. and it does all that above perfectly.
the only problem is if your battery gets thrown from the car or unhooked. chances of hapening? not often
ive had times where n00bs have clicked on my pirates frequency or n00bs fiddling with my radio while im tuning my XTM 24(yes it idles that smooth) and clicking it on and off