First off, let me just say that the rumors are true: you can do "everything" with this synth, and with high quality results to be sure. It does everything you would expect it to do, with some unexpected bonuses thrown in.
Each component of this synth is capable of affecting the sound in a staggering amount of ways. This is complimented wonderfully by the fact that you can save presets for each component. This modular approach is a strong advantage for this synth. Personally I like to make sounds from scratch as I'm writing a track, but with this sprawling synth, having building blocks is a huge aid to workflow. Plus when you're in an experimental mood, you can mix and match elements from your favorite patches and get inspired.
The sound quality is very high throughout. The filters are top notch. I loaded up a saw wave and put em through the ringer, and was way impressed with the results (I encourage you to do the same). I wouldn't say that I prefer analog or digital mode, they both have a distinct sound which will be suitable for different situations. An important aspect of the filter section is the distortion circuit. It can subtley enhance a sound or (of course) destroy it. Also there's a host of modulatable parameters within the filter section (too many to go into) that allows you to make things get super organic and animated.
The oscilators are great as well. SOOOOooo much I could go into here, but I'm going to focus on the wavescanning oscilators. Wavescanning (or as I always call them wavetables) oscilators are my favorite kind. And this is my favorite implementation of them I've encountered. You select the number of individual waveforms that are interpolated between, and then you select each waveform individually from the wave library. This may sound a bit tedious at first, but there's an ace up the sleeve here, and its called the mouse wheel. Just hover over the selector and crank the wheel until you find the right waveform. It's basically the same way you might audition drums sample til you find the one that pops. You can create you're own wavetable oscilators very quickly by just modulating the index with an lfo and then hoverin' and rollin'. I was very happy to discover this. Like I said there's too much to go into in this review, but another great feature of the osc section is that frequency modulation on any type of oscilator is just a couple of clicks away, which opens up yet another splendid can o' worms.
I'm not quite sure why, but the layer system in this synth is working for me a lot better than in other synths. It's just easy to copy and paste a component of the sound from one layer into another, and then take the rest of the components in a different dirrection resulting complex sounds. Also worth mentioning is that the effects are very high quality, and once again have a load of modulatable parameters. This is the way it should be IMO; when effect parameters are modulatable, they stop being effects and become just another module in the synth. kudos for that. Also the unison sounds really great (of course). Another detail that I appreciate is that you have a very fine degree of control on all parameters, which is very important for finding ye old sweet spot. I'm always a little miffed when I see a soft synth that has 127 values for each parameter (its not 1985 ya'll). Which reminds me, the envelopes are very very precise and tweakable. In both the ADSR and multistage you have very fine control of the time and curve of each segment.
So in conclusion, everyone should have one monster synth, and for me it's this one. I know that there are going to be things I realize I can do with synthmaster in the future that excite me, and being a bit of a gear junkie.. that's great. I can remind myself that I'm forever going to be discovering new sounds without having to actually buy a new synth. I could write pages more about this synth, but I'm going to stop here, check it out for yourself!