What about a product can irritate you?

Blindingly bright pilot lights.
Displays that blink.

Mechanical noise, unnecessary lights that can't be defeated, unusual output/input connector fittings and products furnished without a schematic.

Other Thiel owners have no doubt struggled with this one: Binding posts under the speaker. What were they thinking?! If you want to swap cables you're basically stuck with repositioning your speakers. If you have them spiked through carpet it's an even bigger chore.

The only benefit I can see to putting the binding posts under the speakers is a slightly cleaner look, but I would trade that for convenience any day.

I have decided against trying different cables many times for this very reason... On second thought maybe it's a good thing.

Stepped volume controls are the pits. It always seems the volume is too loud at one position and too quiet at the next one down. Also, any mechanical noises heard through the speaker, hum and hiss tick me off.