Official price is 199 $ while with this "No-Brainer" deal it's just 20 $. There is demo version available (sound is interrupted every ~few seconds and it requires restart after 20 minutes) so it's up to you to decide :)
String Studio VS-1 is a string modeling synthesizer plug-in that swaps the traditional oscillator, filter, and envelope pattern for real-life string instrument components. String Studio's pick, bow, hammer, finger, fret, damper, and soundboard let you control the materials, natural decay, grain, warmth, buzzes, harmonics, resonance, friction, tension, and component interaction that make up the sound of guitars, basses, clavinets, clavichords, pianos, and ethnic instruments. And that, with the same scope and versatily that you've come to expect from a full-featured traditional synthesizer.
More info: Audio-Midi No Brainer Deal | Official Website | Sound on Sound Review