rainbow is a german brand so its a little hard to find info on them but woofersetc.com sells them. my set sounds beautiful. the people that use JL think that JL is greatest thing in the world but have never heard of the brands most of us use. im guessing its just local guys that told you that, correct? thats typical.
anyways, all i can speak to is the brands i have used and i recommended the ones i liked. i really dont think you could go wrong with any of the ID speakers or the rainbow.