I was considering these, as i find it a real pain to judge the back, often find that ive got loads of space when i thought i had none.
But if they only work for the last 10cm or so it bearly seems worth it... Or is it longer then that?
noise wise you just put some mufferling over the speaker, i wouldnt worry about that, somone said use tissue or tape over it , and it reduces the noise down to 50% or so...