I use one exclusively for watching stuff on my tablet.
It's been great. BT connection is solid although I always need to go into dev options when it connects to change LDAC from best effort / adaptive to best SQ.
I use mine with xbass and xspace both on, bass and presence selected on the rear switch and atmos enabled on tablet. This will vary depending on what's in / on your ears. I'm using Jewel so you might be different with z1r / z7
.
The included iFi usb cable sounds better than any other usb c cable i have but it's too short and they dont appear to make a longer one. I did ask but got ignored. Ive ended up buying a ddhifi 50cm usb c cable but it's not on par with the ifi one and I've changed back to LDAC.
Battery is the biggest issue for me, it doesn't last long using BT but you can charge and play (it'll stop at 70% if charging whilst on). Don't think you'd get 8hrs from it with BT,.not timed it but I feel like I'm charging it more often than phone / tablet / DAP.
Tested againt my long time serving S2 having had Gryphon for a few weeks now and I wouldn't go back.
Overall really good apart from not being able to get a longer ifi usb c cable (
@iFi audio !!) and battery isn't the greatest but perfectly manageable.
You'll probably want a case for it, I got a black miter case from Amazon, nice finish and fit although the unit will easily slide out of it.