been living with a pair of HS80M for about six months#, next to my Tannoy DFMs.
I wound up backing off the tweeters all the way and am now starting to get comfortable with them as a second reference.
And they are great when the band wants to rehearse in the sutdio - we just slap everyone direct into the HS80s.
Worst that can happen is I blow a cheap tweeter, right?