KZ T1's sound fine on most songs, not much mid bass to be expected but they do have an okay low end and honestly really decent extension - better than I expected. Highs are controlled and extend really well even with bluetooth. Soundstage has this weird cramped feeling at first (maybe from isolation) but do have some depth to them. I wouldn't get these if you want top of the line KZ's, but they're at least as good as the ZSN's. Fit is good and they don't stick out more than the AS10's. They have pretty decent isolation, probably better than all of the KZ's I own except the AS10's. Volume is adequate, maybe a little low. On a song here or there, these aren't so hot with compression such as Incubus - Leech sounding like a dumpster fire with its percussion - especially some hats. Case is nice, the lid doesn't stay open and I wish that mechanism to hold it open had just a little more friction. Charges way too slow for 800mAh but from China that's probably a lot safer than fast charging. Whatever dweeb thought it would be logical to put the left and right IEM's on the opposite sides should never make that mistake again. BETA ISSUES: I seem to have a problem with AAC but it could be my equipment. I cannot seem to hold a stable high quality connection compression wise on my laptop (admittedly it's a linux xps13 with open bluetooth codecs, but it works with all other devices fine). It honestly sounds like poor 96Kbps audio (though full 44/48Khz audio) and drops out after a few minutes. Does anyone else have any issues? SBC works at what sounds like a much higher bitrate but doesn't seem nearly as bright as AAC (though SBC is perfectly fine). AAC should be better than SBC. The codecs on these seem wonky and not performing at their highest bitrates like my TRN bluetooth cables or even the KZ aptX cable when it works, but I'd need others to confirm. SBC works fine with good range, and according to Rtings tests, SBC and aptX are nearly identical. HOWEVER, even though SBC works fine I do experience time to time side dropouts, the connection between them is not rock solid. They do automatically reconnect, but it's a little annoying. No latency issues that I've noticed, and they connect pretty quickly to my devices. They also pair together quickly. These hit right at my expectations for $41 first gen and also my first true wireless. I hope at least KZ Official store fix some issues and send their early adopters another pair for free, though these are 8/10 usable right now - for the reason of annoyances in codecs and stability between ears. They also *very clearly* advertised this is a public beta, which I think is fairly responsible. Can't wait to lose one! Here are some quick rough pics.