First, Stix is fine for that limited kind of drum synthesis. It's hardly unique mind you and IMO doesn't really stand out in terms of sound over other similar drum synths.
But, I'm particularly criticizing this assertion that its constrained randomization is somehow particularly interesting or intelligent, it's certainly not unique. ANY, and I mean ANY Reaktor ensemble that has the different voices separated by (Reaktor) instrument can do this on a completely different scale. You can morph between presets, generate random new sounds, entire new kits, entire new kits with constrained randomness, I could go on. This doesn't even have to built into the ensemble, it's a part of Reaktor and has been so since at least V5.0 going way back to 2006/2007 or so.
The Reaktor Rythmmaker ensemble will create sounds very similar to what I saw in that video. If you want ZDF filters, just drop them in. Rhythmmaker doesn't have ZDF filters because it also goes back to R5, probably earlier.
Randomness is useful, but a new kit "at the press of a button" is more quaint than anything else. It's an uninteresting implementation of patch randomness. As I said in my first post, which I think was clear, I think that it's overrated.
Second, my suggestion is to break free of this idea that there's any such thing as a useful all in one drum synth, particularly with sequencer, that doesn't also load other synthesizers. Maschine is absolutely the best example that I can think of, but, I'm sure that there are other similarly styled workstation plugins that are also themselves plugin hosts.
By being able to load other synth plugins on a pad/note then you free yourself from the constraints imposed by someone's attempt to put what doesn't need to be in one plugin into one plugin. You can combine FM, Physical Modeling, sampling, or anything else into your drum kit.
You're repeating yourself. Let me be clear, I'm criticizing your recommendation for specific reasons. Other people can read my reasons and decide if they still want to shell out a couple of C-notes or not for Stix. I'm not really talking to you, since you like it and all. Sounds like you're happy with what you've found and aren't really interested in looking at the question deeper, so your job is done here, no?But if you're happy with what you got that's great. For anyone else asking for a good drum-synth I recommend STIX.
I think that's clear.If people likes it or not is up to them. But that's my recommendation.
Anyway, I would completely avoid any simplistic drum synth like Stix or Model 500. There's nothing there that isn't already in other synths. I think that Arturia tried to create a decent take on the idea with Spark, but with the proliferation of modular plugins I think that even that is supplanted by newer synths.
Ableton does a great job with Drumracks which allow you to combine existing synths with samplers, similarly, Reason's Combinators also allow a similar approach.
So my advice is to focus on synths that do a great job of synthesizing the type of sounds that you're looking for. If you want physically modeled sounds then synths like Chromaphone are great. For a lot of sounds that are done with generic percussion synths you only need either a good VA synth or a good FM synth. For acoustic sounds, a flexible sampler. For things like X0X hihats, you only need something that can parallel six to eight tuned oscillators. Again, any modern FM synth will give you this. If you don't want to futz with that detail, then plugins like Stix will give you that kind of synthesis (I think, I havn't looked at Stix's hi-hat model), but, IMO, you're better off with a modern modular framework that has those sounds in a module, i.e., pretty much any of them.
My first choice for all of this is Reaktor, in particular, Komplete because it covers all of that ground excellently. Synths like Ace and Bazille can really give you great percussion sounds as well.
) aren't really cutting it - you may just as well use a drumrack with Operator in each pad (I use Live as an example because it's what I'm most familiar with). 
