I’ve owned one previously, and it certainly does have great sounds however I found the interface slightly too limiting to really have fun with it - mainly because you do find yourself paging around the interface. However, despite that, it is a very deep synth and everything is laid out well. No doubt, the costs are kept low because of the minimal hands-on UI. One thing I did like (and lots of synth manufacturers should follow suit, not Elektron I hasten to add!) is the use of endless encoders, so no dodgy snapping of parameters when flicking between pages/presets!
A nice alternative, if you happen to have an iPad is the app Waldorf Nave contains all the same waveforms as the Blofeld and more (http://www.waldorf-music.info/en/products/nave.html), mentioned in the 3rd paragraph.
Not wanting to get start a hardware vs. software battle, but in terms of range of sounds Nave would appear to trump the Blofeld on a few things - not a bad choice for $20 for that Waldorf sound.