If it were me I'd be taking them up on this offer; you'll get a better idea of how the brakes suit you that way than by asking people on here who all have different preferences and experiences.
Best of both worlds? Or worst? Can't remember who but I'm sure someone on here mentioned in another thread about their LBS taking the Hy/Rds off bikes and replacing them with the supposedly inferior Spyres due to the added faff and unreliability of the Hy/Rds.
@mythste has Hy/Rds I think. Sure others will have too. I have tried them on a friend's bike and didn't like the amount of lever pull. I like my levers to give instant feedback, not come all the way back to the bars. Could have been a set up issue but a Google search brings up plenty of other mentions of it.
Cheers.