NI Razor For Reaktor is a amazing instrument! The demo of this beast caught me first, as im sure it did most people with the DUBSTEP WOBBLES. When I finally got the product I had no idea that it did so much more.
The quality of presets are amazing! They have some of the most unique sounds ive ever heard. They even put a new twist on some familiar synths and basses. I really do have to suggest this to anyone looking for a good rich synth. The sound is...well its Native Instruments...duh!. and the interface is very very streamlined. Easy to use, and not ALOT of knobs for easy midi mapping to your favorite controller. 10 outta 10

Native Instruments Razor is a breath of fresh air! It's completely unique, sounds great and looks cool too. Browsing through the available oscillators, filters, and effects, you'll see a few things you may not have seen before on other synths. When you tweak the parameters, you're actually using one single giant oscillator with 320 additive partials. Even the effects aren't true "effects", but act directly on the additive model. Modulation routing is quick and intuitive. The sound quality for this thing is phenomenal, and the CPU usage is manageable (I got up to around 50% on my dual-core laptop, never came close to pegging the CPU). And of course because it's made in Reaktor, you can dig into the structure to see how it works and save your own copy to modify (that is if you have a full license for Reaktor). At this stage I think I'll be happy just to gain a better understanding of how the powerful and versatile Sine Bank module is employed. If you don't have a full license for Reaktor you can still use it in the Reaktor Player. So no excuses!
To address the "but isn't this synth really just made for those dubstep and wobble sounds" argument: yes it can generate those sounds quite nicely. But it can step way beyond them quite quickly. I found myself making some really beautiful bell type pads, which could in turn transmute into some really nasty high harmonics with the twist of a knob. You can create some analog-ish sounding patches, but why do that when you can make swooping galactic clouds, intelligent plasma flux, or sinister evolving nanoscale robot geometrics. If you like programming percussion sounds then you're in for a treat, because Razor can do a wide range of those (sub-bass anyone?). It's very versatile, and can create a very broad range of sounds. I'll reiterate again, that despite the sophisticated concept it is actually quite easy to use. And the graphic display is neat to watch! Well worth the asking price, and one of the coolest things I've downloaded for quite some time (and I am addicted to this stuff).