Running the review I'm running right now, I've had the opportunity to authorize a lot of software from a few different companies, and Native Instruments has definitely been the most problematic experience. In fact, it is the only experience that was problematic at all; IK Multimedia's stuff authorized just fine on the first try, Peavey's ReValver MkIII uses a crazy authorization thing but it works like a champ, no issues, and the iLok crusaders only have trouble if your iLok shit is messed up, but Native's server is a hassle and a half. I still have a totally bunk Activation Return File that they have no record of issuing and which did not cause the software to appear registered on my account. They can't explain how I got it and they don't really know what happened. It works on any copy of Guitar Rig 3, but it doesn't actually do anything, it just says that the software is activated in the Service Center but doesn't actually, you know, activate it. Crazy stuff. I finally did get it activated, just in time for release 3.2 of Guitar Rig 3 (which comes with the 64-bit drivers for Rig Kontrol as well, only a year and a half behind schedule
I don't know, they're obviously talented software people and their products are amazingly impressive when you hear about them and what they are intended to do - especially if you're just looking at the design documents. But the end result seems to be successful inversely in proportion to how ambitious and broad it tries to be, especially until they get some patches into it. Guitar Rig 3.0 was an absolute nightmare, I couldn't even render anything with it, I had to live render its output to a spare track and put up with whatever oversampling I could accomplish live. Trying to render anything would result in this amazingly loud (like, 630dB clipping the digital vmeter) space-ship kinda sound, it was actually pretty cool so before I patched up I made a little sample library of some of the ****ed up sounds it made.
Guitar Rig 3.2 is a good program, not overall the best in terms of amplifier model quality (they range from decent but lackluster, to genuinely excellent - no useless ones or real stinkers, though) but the effects are top notch and the control and routing options are fantastic.