I have a BSII and its a fantastic synth. Out of the similarly priced analog mono synths on the market (new) - this one probably has more bang for buck. Yes it does lead to that TB-303/acid bass synth sound - but you can break away from this and sculpt up some very unique sounds on this. Just think what you can do mixing 2 Oscillators - detuned, with a sub 2 octaves below, add some noise, some ring modulation, some distortion, some overdrive and BOOM!
The keyboard is better than the MiniBrute (which are known to break very very easily - like what happened to mine) - with aftertouch its pretty nice! The plastic case/chassis is surprisingly sturdy - and I would say it would last in gigs if you were careful with it. The presets that come are a great introduction to how to push this. A lot of the other mono-synths priced in this bracket do not have 2 oscillators. The sequencer and arp are awesome - and I have so much fun with it. I like how the control surface is completely digital, which means you can use MIDI to control knob positions and save all this via patch memory or SYSEX. The only thing missing badly on this synth are CV input/outputs. This will be a classic synth for many years to come, and is staying in my studio.
I should also add - that I also own Arturia Mini + Micro Brutes - and both of those will also stay in my studio. These all have unique characters, and I find they excel at different things.
Here's a track I wrote with the Bass Station II, MiniBrute, MicroBrute and a bunch of other synths (see if you can pick what I used the BSII for): https://soundcloud.com/ranzee/infinitum