Thank goodness Thomann are good at returns and exchanges, as these earbuds became an integral part of my live setup, then both the original set and replacement both generated a fault in one bud (not due to a build up of wax as is the first port-of-call).
If I could afford professionally molded IEM at the moment, I would definitely go for it - the EP4's were part of a 'trial' to see if there was a benefit to this type of live monitoring. The affordability of the IEM package meant I could give it a go. Now I can't ever go back to relying on just wedge monitors, as it's a world of difference, even with an entry level setup like this.
Everyone's ears are different, and I find that one bud pops out throughout the night (using the biggest interchangeable tip). So not ideal, but for the price; really good.
I should say also that although they don't sound incredible, they are a few levels up from the included buds that came with the transmitter/receiver - much clearer and don't get vacuum trapped in your ear canal!
Don't want to sound negative, just trying to give a balanced opinion on these having used them at every gig since the middle of last year. Cheers!