MJR,
I've heard of them, insofar as they gave be a freebie copy a few years ago which I promptly put in my cupboard and never got round to testing.
Rather than seeking people's subjective opinions round here, I suggest you look at it objectively and see how Bullgard fare on the various AV comparatives.
For example, the AV Comparatives Real-world tests show you exactly where Bullgard stand against the competition,
see here