Freak

As title
Are these two bits of kit any good?
Do mega miles , and im starting to think i need to get something like this- i am definately going to buy a jammer, erm i mean garage door opener , but ive found a cheap package for the two of these together.
Any good? or not worth the plastic they are made from..
reading the specs and bumph is all well and good, but i need to hear from people who have actual experience with these things
Give me the gen people.
cheers

p.s
P.c/speed kills/whatever brigade- hit the back button on your browser now.