I've personally never heard about SoundMagic. So I could only go by the Amazon reviews.
E10 model has a decent amount of reviews. According to FakeSpot these reviews are high quality, thus likely to be real.
If you want my suggestion for budget IEM's - it will be Shure SE215. They are on occasional sale for $89.
If your budget is very tight, maybe worth to try Shure SE112-GR
On the extreme budget end: Koss Sparkplug isn't bad either.
Source: I own Shure SE425-CL.