I think it's just a little inconsistent, or is easily affected by age or handling/storage conditions. I've bought it 3 times (all from FA UK)...
May 2014 - 4ml-ish sample in 10ml bottle - only a drop or two left, looks fairly clear, tastes OK if fairly weak
Sept 2014 - 10ml in FA bottle with fat dripper - yellow tinge, slightly eggy (?), not so sugary tasting
March 2015 - 10ml in new-style orange FA bottle - completely clear, sugary tasting
I've been using the Sept 2014 one quite happily, so when I say "slightly eggy (?)", I mean it's not particularly distinct and am just using your descriptive term. I don't get any obvious sulphorous odour from it, for example. I might just as happily describe it as perhaps a more buttery taste. One thing's for sure though, the Sept 2014 and March 2015 don't taste the same, are different colours... and the later one is better.