Go but be warned
HH work for the company NOT you
HH occasionally fish ie, no actual mandate
Companies often interview purely to gain market intelligence
If they have put you in tough with company then (2) seems invalid for this scenario
Get them to speak first – you should be able to tell if they are genuinely recruiting or merely digging for info on competitor
Good luck
p.s. be careful how you communicate with your boss. One guy came to me and told me that he had been approached by a competitor and offered a higher salary but didnt want to move. He was surprised when I told him that it was the wrong decision and by my enthusiasm for him taking the new offer!!