Battery has become my favourite and most-used VST sampler – replacing both HALion, and my hardware sampler.
It's a deceptively powerful and flexible instrument, capable of doing much more than playing the supplied drum kits.
I use it for just about everything; single hit sounds, loops, basses, vocals – even for triggering AIFF mixdowns of other VST instruments (a trick which can save you a lot of CPU, especially if the other instrument is Reaktor).
I like the GUI, and the fact that most parameters are either visible immediately, or just one mouse-click away. I like the built in waveshaping and bit-reduction effects, and I love the option of having up to eight stereo and sixteen mono outputs to the VST mixer!
The "FX loop" function, with its snap-to-zero option, makes it very easy to create looping sustain portions for pitched sounds (as well as nice glitchy drum noises), and the pitch envelopes can be used for some excellent "warped" effects.
Copying a drum loop to multiple cells and adjusting the Start point and amp envelope settings for each copy makes it surprisingly easy to separate phrases into single hits – for "do-it-yourself" ReCycling – and this is something I find myself doing more and more.
The only thing that Battery lacks is a resonant filter – and it's so easy to insert (for example) OhmBoyz's freeware Frohmage into a mixer channel that you soon forget about this omission.
To sum up: an extremely usable, functional VSTi, which I have come to depend on probably more than any other.
This is a surprisingly versatile (mono) synth, capable of quite a wide variety of sounds – not just acid-y basslines (although naturally it's great at those).
There's a good selection of oscillator waveforms available, and the Sync and Ring Mod modes can produce some unexpected variations on the basic sounds.
The onboard FX are excellent, and very usable.
The supplied pre-sets are good – but the Tau Pro is fun to program, and you'll soon have made a bank of your own sounds anyway.
On the one occasion I contacted Muon customer support, their reply was quick, courteous and helpful.
The Tau Pro has a couple of limitations to be aware of: there is no ADSR envelope generator, and pitch-bend via MIDI is not implemented. In practice (and in my opinion), these don't detract much from the value of the synth. However, if in doubt, download the demo, and see how it handles for yourself!