Hi.... I own the "old" ones too- the ER1 and EA1.
I used them alot in the beginning, but now they are rarely used. Today I find them more unprofessional than I used to before, but I guess thats the way it goes...
We all starts out with cheap equipmetn I guess and then getting more and more pro over time...
But I havnt said that aint good or cant be used, but I cant find them that useful and I would waste my money if I bought those I think....
Just my opinion