Do not want to be negative about Costco as I have had a good run with my KS10s. Yes, I was affected by the charger problem as with others, however as soon as I explained that I was having persistent issues they asked me to return the aids and charger and I received them back a couple of weeks ago, now working perfectly.
Anyway, my hearing is now slightly worse than is indicated on my audiogram (need to update it). I am now firmly in the severe to profound loss category. One thing I have noticed is that music is a lot better wearing a BTE (Oticon Dynamo) than with the RIC (KS10s). With that thought I broached the idea of an upgrade at Costco.
The fitter made enquiries about the Phillips Hearlink BTE. He said there was a rechargeable and a disposable battery option, but the latter was only available with a size 312 battery. He said that would be insufficient for my loss. He then enquired about the Jabra (Pro I think). This had no BTE option, but a RIC with a size 13 battery. I asked about Rexton but he said this was older technology.
I am unsure now whether to forget about the BTE altogether and stick to RICs with a UP receiver. Certainly there appears to be less choice in the severe/profound category. This is in general, not just an issue with Costco. This is worrying as the severe/profound loss segment requires specialised aids with more horsepower/different sound processing strategies - more linear sound etc. I say worrying - I mean also from a financial viewpoint as I have never seen superpower aids discounted.