There's a comparable system made by Gorilla that's got all the same features but costs a little less. And the horn/siren might be a little bit louder. I have no FHE with the install and have only heard the alarm messing with a friends bike. But they're all loud when you're right in front of the bike....
As far as the scorpio goes.
It's a good alarm. In my experience, if I can't see the bike (line of site) the alarm's not talking to the keyfob. The range ain't the greatest. I guess that's purely your milage may vary....
It certainly worth the money to me just for some piece of mind.
If you're putting it on yourself PM me and I'll give you a few suggestions.
They make 2 different types of keyfobs for the 500 series model. One is charcoal colored and uses 1 AAA battery, while the other keyfob is silver and uses a rechargeable battery. The newer silver keyfob will not work on any 500 system produced before the spring of 2006. Just a heads up.
It's a good system overall. My only gripe (a small one) is that the range of the keyfob isn't that far. Otherwise no complaints.
FWIW, the range of my remote dosn't require line of sight. my bike is in the garage on the street level and i can have full control and 2-way comm while on the second floor in a building with a concrete structure. the waves travel out of the windows and reach the bike three floors under me through the garage door and i don't even have to be close to the outside wall. it works very well even 17 feet away from the wall.
it also works well from a restaurant on either street level or first floor.
you also don't have to turn on the perimeter sensor either, it's an option. You can alarm the bike without it, so that it will be set off if the bike moves, I usually leave it on this setting. In those cases where you don't want someone walking up and touching your bike (great for keeping traffic agents away [laugh]) than alarm the perimeter sensor with the remote.