I've had Grados for a while now, and I love them. I've also read a lot about magnums and they look very interesting. I couldn't resist and sold my SR225i (surprisingly easy and at a good price in Costa Rica) to order all the components to build a set of magnums.
I am going to use Symphones X drivers, Vibro Classic Cups, and stock headband and cable from Alessandro MS1 for now.
I am not sure they count as magnums, and certainly is not modification either, but hopefully they are going to be the last headphones I buy in a long... Who am I kidding? Maybe I am wrong, and the placebo effect will affect me, but I have high expectations for this headphones.
I am starting to understand the "sorry for your wallet" thing now.
Hope my English makes sense.