Can't help you with that maker, but I'd encourage you to look at Westone IEMs. They've been making them for a long time and do custom fitting if desired. Many touring companies use them on stage, so they're built for work. I've been using a pair of UM1s for about five years while working out, hiking, and working audio. They cut ambient sound 20db+ and sound clear and true. I use a pair of UM2s for hifi listening. They have a new model out, UM3. Take a look at them, I highly recommend them. Do a search for reviews.
http://www.westone.com/Best,
John