I know for a fact there very usefull dogs ,seen one take anything from rabbit up to roe and female fallow deer . even some smaller wild boar , all single handed.
But most off all excellent hare dogs (europeean brown hare ) ,,plenty off stamina and far more biddable then the saluki
There a very hardy breed very little problems and a lovely pet as well
I would think they are very usefull for lurcher breeding ,The only thing i think would need some improvement is there coat although the rough haired version is a bit better then the smooth coated.