I must say, I doubt if any real burglar uses this design - it narrows your field of view considerably. For the professional burglar, this could mean missing nice nickable things. For me, it meant lack of peripheral vision which is pretty vital on a crowded dance floor. The other thing I learnt was that it's a pretty poor disguise. Lots of people recognised me easily including Diana and I recognised her too.
Interestingly, There were a few friends I had considerable difficulty recognising. Afterwards I started wondering if this was something particular about them or just effective mask design? Maybe it's the masks - there was one lady who clearly knew me but I never identified. The mask she wore had lots of dangly tassells - burglars take note!