I've a Microbrute.
It's an interesting and good sounding little synth but I'm not sure I'd recommend it as someone's only synth.
Pluses are the interesting and unusual oscillator section which allows mixing multiple waveforms and modifying each of them as well. The filter's something a bit different to the usual Moog or Curtiss chip style ones, resonates nicely and can be over-driven. The key bed isn't bad for the price either. Once tuned it doesn't drift much.
Downside is the single LFO amd envelope and the not always obvious way some of the controls interact. The miniature patchbay extends modulation possibilities a bit but you've still only the one LFO. Though that limitation never hurt the Moog Mini or Korg MS 10 or 20. The biggest weakness is you can't tune oscillators to different octaves or offset them by fine tuning. No noise generator either.
I've not tried using the built-in sequencer so have no opinion on that.
For an inexpensive synth that is relatively straightforward in a live setting and has quite deep programming possibilities (though a complete pig of a thing to programme thanks to the interface) I think the Alesis Micron/Akai Miniak takes some beating. Not the most refined or analogue-sounding device, if anything a little bland, but it can do most synthy things OK and the extra keys over a 2 octave synth are very useful. I've heard them played through serious PAs and they don't sound at all bad for a cheap computer in a box. They seem to turn up second hand at quite low prices as well.