Diabetic Chocolately Awesomeness

I've recently come back from a trip to Vienna, with a brief stop-over in Belgium either side. Belgium is not my favourite place on the planet. Don't try to change my mind; I will stick to my guns. But one of its (few) redeeming features is the range and availability of sugar-free (principally aimed at diabetics) confectionery. I managed to to pick up great slabs of two varieties of chocolate, chocolate coated waffles and a sugar-free Nutella look and taste-alike in a smallish supermarket in a provincial town for around 14 euros. Most of my haul was (I use the past tense as most of it has been consumed already - whoops!) sweetened with maltitol but some made use of a sugar substitute called Tagatose. It tasted okay but I have to confess feeling a little wary of it, it being entirely new to me. Anyone heard of it?