Glossy?Meh, I'm not a fan of the IOM Ultra either, which has the glossy black panel going all around, from the front to the back. Makes no sense because it doesn't have a screen
I like the plain look of the Vibelink although I would've preferred no volume knob at all. If paired with any of the WiiM devices, I suppose the volume would be controlled by the source in most cases. That would make the Vibelink's volume control redundant.
I have IOM Ultra.
Probably one of the first made in Space grey and it's matte-black.
About pop while turning on that @EddNog mentioned. I don't hear any noises. So IT can be the characteristics of the whole setup, or the specific unit (i have plain version only with RCA, no XLR)