Ravelco anti-theft device, does this work?, Does this device seem like a good idea? Options

[rabbit]

Hello Everyone,
I just bought my very first Celica a few weeks ago, a 1995 GT convertible. In fact it's my first new car in 18 years. Yeah I know, I probably ancient by most of your standards, but I hope you don't mind if I stop by from time to time, as you all really seem to know alot about Celicas. I've learned alot already from reading the posts here. Well, anyway I really love this car. In fact as I was telling my friends recently, if this car were a woman I'd marry her. Since I have to park on the street during work I'm interested in installing some kind of anti-theft system. I've already read all the posts about car alarms on the forum, but I'm wondering about other anti-theft devices, in particular the Ravelco anti-theft device.

http://www.ravelco.com

Has anyone tried this yet? Does it look like a good idea? I'd love to get your advice before I make a decision. Thanks in advance for your help.