@alvinlim2010 What RedTwilight said, especially in terms of the soundstage. I should probably research, because I also don't know how the dimples make such a difference (apart from roughly guessing they disrupt the delivery of the sound, causing the incoming wave to bounce somewhat before it gets to your ear) but on the Havis, they made the bass more full (without bloat) and they widened the soundstage considerably (to my ears)
If you don't already own some, I would say they are really worth having in your arsenal of tips. One of the major lessons I've learned since dabbling in the Chinese IEM market is the degree to which you can change the sound of an earphone with different tips. Currently using LZ A4s with foam tips and while the Spiral Dots sound very nice on them, the foam tips give me the best combination of seal and sound. Still, I am in the experimental stage and every now and then will try out different tips just to double check I am getting the most from my 'phones.