This one is so far below the quality of any other Ive bought that I really have to wonder. My feet are a little wide but not enough to order a wide width. I have recordings electronic keyboard tracks with 20 hz basslines, the lowest humans or CD can do and these are clearly audible on my system as are 20hz tones. The scroll wheel isnt loose like on earlier copies of this mouse, but it is very stiff, but it works. This has significantly reduced my husband?s blood pressure to the point where he has begun reducing his meds for high blood pressure! Skeptical of buying online without trying on but went for it with these. Re-assembly was quite easy. We finally decided it was time to get these bikes out of the way / off the garage floor, but we needed a two pack of whatever we landed on. It kind of relaxed me. She loves the sound quality and I purchased the gold lenses for her.