I picked up my new RGC couple of weeks ago--had the dealer install the siren (and a couple of other items) before I took delivery--but didn't get the pager.
As has been stated, the siren isn't as loud as I had expected. But...., having an AUDIBLE alarm does get me a little (not sure how much) discount on my insurance (Geico).
Considering the value of the bike, the siren does give me a little extra peace of mind. And it just might scare the s*** out of some little gremlin who might want to sit on it in the restaurant parking lot.