Went through a little back and forth recently with the AZ09/Pro. Got the AZ09 as a gift from Amazon, tried them, thought they were fine, but was curious about potential improvements of the Pro for only a couple dollars more. I only have an iPhone, but have a Hiby R4 ordered, but the AptX is currently lost on me until that arrives.
Jury is still out. I do think they sound fine when they work. I'm using them for walking around the house with one in/walking around the neighborhood with both. Had a lot of cutting out while walking around the neighborhood today. I also don't like the floppiness of the Pros, when using one while laying down it dangles in an annoying way. I ordered the TRN BT20 Pro and the normal AZ09 again on AliExpress for relatively cheap, and might just go back and forth with them based on which IEM I'm using. FWIW, the KZ EDX Pro X sounded pretty good with the AZ09 Pro, at least for walks where I might get sweaty and won't be too concerned if they break.