Resound Linx 3d - 5 vs 7 vs 9 models

I have a pair of the Resound Linx 3d 5 and have the option to upgrade to 7 or 9 model. Anyone else upgrade? -Wondering if the sound quality is worth the price increase?

top level commanded only when you are active lifestyle and can not take out HA on frequent chaning environment.but i dont have linx 3d but tried linx2 5 once for hour background noise is more in 5 so i will recommand if you discover noise more interfering to you in understanding speech and you frequent go for place like outdoor restaurant. or your loss asymetrical or more speepy slope. which need more finetuning