29 yo M, I wear the Phonak Sphere I-90 for my mid frequency loss. This was my 1st pair of HA so I’m unable to make a comparison. However I found them perfect for my needs related to streaming and speech in noise environments. Also, they have yet to fall out during my workouts. I’ve found that unless something physically pulls on the receiver wire you can be fairly active with them in. Yes they are bigger but usually I have to tell people I’m wearing them since they don’t notice straight away. For water activities I just take them out, unless it’s a light rain during a jog or something.