I prefer using a battery siren, like the DEI 515R over using the 520t battery. Or use them in combo with each other for added protection. The thief can cut the siren wire and rip the siren out, and it will still be blaring in his hand.
The tilt sensor is a good idea to protect wheels, because if a thief is very gentle(almost none are) when jacking up the vehicle he may not trigger the shock, but the lugwrench almost always will.
I'm personally not a big fan of stacking a bunch of sensors on an alarm. It tends to lead to excessive false alarms no matter how carefully they are adjusted. I especially don't like radar sensors unless in a very specific application. To often they are tuned way too sensitive. There is zero reason for an alarm to even go into warn just because someone is 2 feet from your car. That's just more false alarms to deal with!
As with anything electronic the installation is absolutely critical. The best alarm on the planet wont help a thing if it's installed poorly!