I've been using the same alarm as Piper for more than 2 years with no problems, bought from the same guy. He gets them direct from the factory in singapore, is honest, and gives good after sales service (I bought a spare remote for mine off him when I lost my keys). I've also installed 2 more in other bikes with no issues.
I've also installed an alarm very similar to that prike one in a friend's kawasaki. It developed issues after six months and started flattening the battery.
I'd go with the cheetah one, if for no other reason than I've got the wiring diagram to fit them to our bikes on my website. The link is in my signature.
