i have been using radiostar king leopard (i think this is the name since i have been using it since about nearly 2 years already, i was among the first batch of ppl to istall it)
the range is okok for me
signal from remote to car isn't that strong but signal from car to remote is definately great
as for someone who asked earlier
yes, my house has lots of cordless phones (dun ask me why) and i am also using wireless and so am my neighbours
so far, no clashes between these things and my car
been a good alarm for me