The Post celesta is not the latest 900MB-heavy instrument (far, far from it) but it is definately something magic. If the demo at Michiel\'s website is not enough, I will record a short tune and post it here, just ask...
We did this short Nutcracker exerpt lately as a new demo for the Post Celesta.
The Celesta is a 32 MB instrument. If you find it too bright I would suggest using a Low Pass Filter to adjust the timbre to your taste. Controlled via velocity the filter can make it warmer. Though I must say the original instrument is always very bright.