Loading ALL patches (1. & 2. Violins, violas, celli, basses - see their www for what that includes in this first version) in Kontakt Player 3.5 uses around 2.35 Gb.
(That is with one mic position, could be stage...) The Player itself goes for around 100 Mb. (You need the full Kontakt version - I'm just checking out using the demo version until the other arrives.)
Loading eg only "1st Violins Long Normal Stage" - meaning legato/sustained/no vib/vib/crossfades type of articulations, takes around 300 Mb. Not bad...
Hope this helps. Sounds nice by the way - compared to VSL the arsenal of art. is ofcourse smaller.