I have had HAs for 40 years plus. Spending thousand of pounds on private aids. I then changed to NHS phonac 7 years ago and bought a Roger Pen, had shoes fitted on the aids and that was Bliss there was nothing I could not hear. 5 years later NHS changed their supplier and we all now have Bluetooth Signia aids. My Roger Pen is not compatible so I have had to buy an additional Loop aid which converts the Roger Pen so now all is almost well again. I do love using Bluetooth though as like others have said the phone calls go straight through to the aids as does everything on the iPad, but sadly not the iMac which does not have proper Bluetooth. I don't use my app much but change from the hearing aids. Left is programme change I have 4 on mine, right is volume. and once you adjust one it changes both, very easy to manage. Mine are moulds, which I need now, the in the ears aids in various sizes no longer give me the volume I need.
Having said all that, no aid are going to be perfect, My cochineal is worn so I only clearly understand 9 letters of the alphabet, the rest could be anything, so it is no9t always the aids, but the actual ears that are worn out and sadly cannot be repaired. I manage easily one to one, but struggle in crowds, the Roger Pen does not improve crowds as it just makes it all louder even when I cut the background noise off on programme 2. You need to experiment with your hearing aids go back to your supplier, they cab adjust them on line with you if you have digital. Your supplier should have set them up for you on the app and explained everything to you. one took over an hour going through it all with me and gave me a print out showing which aid does what. Very thorough indeed. I have my tubes done every 6 months, once they go hard the input diminishes. So that is important to remember. Good luck with your new ones, I hope you get to love them as much as I do mine. I have severe tinnitus and reversed hearing loss, so struggle with men's voices much more than ladies, particularly on the phone.