I’m now a hearing aid owner and very happy wearer! Costco ReSound Forte 8, 62 RIC (13 batt), Medium Power receiver with a Phone Clip+, since I have a Pixel 2 XL phone with Android v.9.0 / Pie, and stream music many hours each day from phone or watch Vizio TV where I cast MLB at Bat or Hulu from the phone to TV, then via Avantree Oasis BT transmitter to Phone Clip+ direct to my ears, All this streaming is why I choose HAs with size 13 batteries. What a wonderful experience to hear well again!
My Costco fitting was excellent, with the HIS (Collin) going through all the steps and explaining everything on each step. The first thing was many steps of REM with three different tones, or garbled speech (Collin stated it is seven different languages spoken by men, women and children all at once to cover a wider range of voices).
1- in front of the speaker with tones, then garbled speech with the REM pickup device around my neck, ends with mics on my shoulders to calibrate the device.
2 - REM mics in my ears with no aids to see who my ears responded to the tones or garbled speech. Seeing live on the screen how my pinna directs sound to my inner ear was fascinating!
I’m such a total geek. 
3 - REM mics in ears with HAs in place, tuned to my audiogram only.
4 - REM mics in ears wtih HAs, and he tuned settings to what REM results showed with tones and garbled speech, then played some sounds (bells, wind in trees, cars going by, water running, siren in the distance) and speech, man, woman, or child and asked if I understood clearly.
We talked about target settings, I stated I was highly adaptable and knew I had to learn to work with new sounds. He crumpled some paper, dropped a pen on the chair mat, I said they were loud, but not overwhelming. I told him about using the IQBuds Boost that adjust sounds with the NAL-HL2 formula with a phone app. He had me at 90% target,then moved me to 100% and suggested we try this in store to see how well I tolerated that level. I went home at 100% target.
We paired the HAs to PC+ (Phone Clip+) and PC+ to my phone, I walked around the store, came back, streamed some music from my phone. This with open domes, I did not like the music, lacking bass notes especially. Then he installed tulip domes, and I repeated the actions, music better, but still not much bass notes of jazz with a stand up bass. Then he installed some bass domes, and the music was much better, though obviously my voice got that in-a-tunnel sound.
I went over my whole checklist of items, many of those I gather from reading here on Hearing Tracker forums. We talked about the new Quattro, he had not heard of it but would investigate more. He thinks Costco will continue the ReSound line, as it is a strong seller in this store and others he knows from internal sources. Collin put four each of open, tulip, and bass domes in a baggie for me to take and experiment in the next two weeks before the first adjustment appointment. 
At home I listened to some music on home speakers, TV, and played with settings in phone seeking music nirvana. I use Google Play Music service and it has an equalizer, so I set that with some bass and midrange boost, the PC+ has a bass boost while streaming, and I can get as good a sound as I can with ear buds on my hearing loss. That bass boost on the PC+ works well too, better than listening with the speakers attached to the TV. I like the streaming to HAs direct better, since I can mute the aids, eliminate other noises like fans, fridge, outside sounds of traffic two blocks away, neighbors outside, the sounds I don’t hear without HAs. 
I was out at dawn this morning, to a small park two blocks from my apartment. Birds, insects buzzing, the early morning runners shoes on sidewalk, a worker washing down the concrete areas at the local swimming pool, planes at the airport (2 mi away), the mission bells downtown. What a treat, I think I’m still high on those sounds. I came back and put some old jazz on and had my OMG moment with Stephane Grappelli, Django Reinhardt, and Lionel Hampton. The violin and vibraphone high notes sent chills down my spine.
I’m not going to follow through with Oticon OPN 1 via Hearing Revolution after the fitter they sent me to was unresponsive to questions when I was there and a later phone call about receivers. She could care less about a person referred via Hearing Revolution, and her antagonistic attitude showed it.
Collin is perfect for my personality with all things geek and tech, why go anywhere else? I have the ReSound Smart Fit program installed, so I can investigate settings, knowing Collin will be fine with that. As I left, he said this was the most fun on a fit he had had in a long time, as we thanked each other for the great exchange.
Now I’m learning the Smart 3D app, it is highly configurable, much more than I expected after testing it in demo mode and going through its features. This is good for a hopeless geek! 
