I can second this, but the Vido responds well to bassy eq, pushing really close to EMX500. Glad to be able to confirm that HCK's Vido sounds the same as my Vido acquired from Taobao. I have 3 of them now, all with different jacks, so I was a little apprehensive at first. Then again, None of the three are identical as two are with mics, and neither of those are the same color. So far, I'd easily pick this over Qian39 for bass & vocals.
You might find the PT15 lacking for bass, as it's greatest strength is in treble. It's a very nice earbud in that respect, but for the intended purpose may come up lacking. It should compliment the Vido decently enough however. The Qian39 is decent and has a rather uncommon shell design which I find quite comfortable myself.