I still waiting for my JBL C100si to be delivered for doing proper comparison.
However, I can confirm Piston 3 is less bass, if compared to my Edifier H210P, even lower than earphone from smartphone like OPPO Find 7, but Piston 3 has the clearest treble and mids.

Then, judging from some online user review from Amazon, the JBL C100si has very good bass, a bit muddle in treble.
So, I assume JBL is more preferable to basshead.

Already can answer you, this JBL C100si beat Xiaomi Piston 3.
It does what Piston 3 doesn't, it pack very good bass.
It's treble and bass are similarly strong, best recommended in-ear earphone within this price range.
It's wearing ergonomic also nearing Piston 3 level, not equally comfort to wear, but close enough.

Already regret didn't buy another pair on last week cybersales where it's price drop to RM29.90 and still can get further voucher discount.

http://www.lazada.com.my/jbl-c100si-in-ear...k-12484797.html

aukey

price increased dy. 

i bought mine for RM81.90 - 24.50

can reckon wireless headphone please...