So, I've been wanting an alarm for a while now. I'm frequently to lazy to bring my bike into the apartment, so some nights it sits out on the patio, or even in the parking lot! This is Dayton, people. Some douchebag kids would steal a flower pot if they thought they could grow heroin in it.. I also commute, so I leave my bike unattended in lots of places I'd rather not have to. So, I ordered a Xena XX-10 from motorcycle-superstore for $90 plus tax, with free shipping. Find a better deal? TELL ME! Their new Buy-safe crap will pay me the difference. Anywho, it's a great little device. I chose the XX-10 because it had the same design as their top-of-the-line XX-14, just a (wait for it) 10 mm locking pin, instead of a (again...) 14 mm locking pin. I don't even know how one could begin to cut the pin though, as it is completely concealed in a big yellow steel blob. Pretty heavy too. Go caveman on somebody with it, and they're not getting up. A quick description: So, the locking mechanism: It is kinda tricky. Not really, but it has a "double locking mechanism" All that means to me, is you have to line up the slots before your key can go all the way in. Which, when under the pressure of having your ear drums blasted, can be... Tricky. I generally make sure that when I lock it on the bike, I rotate completely counter clockwise before pulling the key out, without rotating. That way, when I'm unlocking, I gently as possible, but quickly shove the key in, rotate clockwise until the spring-loaded pin pops up, and yank that thing off my disc. Soon as it detects motion it starts to beep, so I try to minimize those beeps. Which brings me to: the alarm. It's not as loud as a car, but it's not hooked up to 12 volts. It doe shave quite the blast, though. In one of those high pitched, make you want to rip your ears off, kind of ways. When the very sensitive tilt sensor detects motion, it begins to beep five times. I think they are faster than once per second, but idk. Then, it goes into "gtfo" mode and wails that high pitched siren... Makes me cringe thinking about it. The siren lasts for about five seconds. if you don't touch it any more. I haven't tried to keep it going, so idk if it would stay on longer. It is auto-arming, so you don't have to push a button. It works like this: There is a laser, or other wave emitting thing on one side of the lock, that bounces off the other side. When your brake disc obstructs that it gives you five seconds to either change your mind or get it locked and get out. Eh, kinda. It beeps, then gives you ten more seconds before it turns on the motion sensor. Pretty legit. My thoughts: It works. Literally on the night I got it, and installed it, some douchebags from my building apparently brushed against it as they walked by. I can't say if the bike woke me up though, because the dog was already howling like the retard he is. But, the alarm went off, and I heard their apartment door close by the time it shut up. The paint scratches off pretty easily. Mine looks a year older already just from scooting around under my passenger seat. I'll update on the rustability of their nickel-ey steel. Overall, it's a good investment. Eases my mind when I'm out. Win. btw, have fun getting the battery in and the reflector plate on before it wails in your face.