The Er-20's are ok if you have nothing else but i would recommend you spring for the Er-15's (i dont work for Elacin by the way ;) ) the reason being as the 20's are not custom fitted they only really do half the job and to be perfectly honest are not that comfortable after a while ,the Er-15's on the other hand as they are custom fitted are much more efficient in blocking unwanted freq's etc and are a lot more comfortable to wear in fact you barely notice you are wearing them.Originally Posted by Apex Beat
As for mixing while wearing them well that seems to be a personal preference thing personally i have been using them for about 3 1/2 years with pretty much no problems at all if anything for me they improve the sound, one thing i would add is if you do go to the trouble of buying any earplug then make sure you do wear them for the duration of the night if you remove them even for a couple of hours just to play your set or whatever you will still do a similair amount of damage to your ears as you would have if you hadn't worn them at all.