I bought the VSD1, hoping it'll be an upgrade from the Vsonic GR02be I owned for a year. The VSD1 is not a bad IEM, it just doesn't live up to my expectation as an upgrade, more like a sidegrade, so I decided to get the GR07be a month later and sell this VSD1.
I like how it has a warm and full sound. However because of that I feel it's a bit muddy for my ear, (comparing to the GR02be which has a cold and thin sound, therefore clearer). What I don't like is its increase midbass. The increase bass is not much, probably +1 or +2 dB more than its bigger brother GR07be. I guess my sound preference is more on the neutral side than a warm sound signature.