I have and enjoy both. I have dinky ears, and can't use foams. The EM5, being lighter, is easier on my ears, and has a full, robust sound... maybe a tad more bass. The Chaconne is brighter-sounding, still with enough bass (for buds), but the weight in the ears can be a little fatiguing after awhile. The left Chaconne bud cut out after two days of use, and were replaced by the vendor... so the back and forth from China was time-consuming. The replacement pair work fine (so far), though. Less expensive buds I enjoy (and are small enough to fit) include the ISN Rambo II, and the LBBs.