Sorry if I'm a bit late to the party here, been listening to these for a while now and haven't felt the need to really get on the web to look into other iems. The biggest challege I found with them is the overwhelming amount of sound signature choices. It was quite a daunting task to be able to narrow down what worked the best for my taste. I would recommend anyone who has an opportunity to pick a pair of these up would be to let them play for a good bit of time before sticking them in your ears (non burn believers turn away) because i thought I had my sig down (black and red) then I noticed a gradual chantge and settled at red tip pink filter. Good job Bob!