I havent heard the 500 module but Im so glad I didnt try to save a few bucks. I will purchase another pair however, as I liked my old red ones so much, but will take my custom elsewhere if they dont last long. My Newport sandals where better on these surfaces, Im thinking of sending them back and getting newports but i have worn these in the river & am not sure if they will . The way the sole is designed, snow can get packed in there, so I would not recommend these for running in the snow (the fabric top is not waterproof either, so your feet would get wet). They now seem to be much more comfortable. After losing my old 500 and 600 earpieces in one week, I bought this and a 250 as replacements. Smell hasn?t been an issue even though I?ve been using them as my ?dirty feet? pair. After a few times wearing them, they adjust to your feet! The "touchpad" area is way too small to be practical. Super uncomfortable to walk in.