I had a meta on my last bike and was good, but I would never have one fitted again its just a pain the the ass. I have the GSi oxford immobilizer on this storm
I have had top of the range Meta alarm and immobiliser on all of my bikes, never had any problems...........but I use optimate charger every few days so draining the battery never happens.
Make sure you get a cat 1 though whatever make you choose.