I have HS50Ms & thought it was a big mistake
Every mix I did on them was totally wrong when played elsewhere. The bass response doesn't so
much roll off as f**king plummets. I have a nord 2x rack & I had no idea of the concrete crushing subsonics
it kicked out because of these.
Black Eyed Peas - Boom Boom Pow sounds like Bip Bip Poo, on these. Have a friend who has HS80s & he
has a similar problem except he has about 4Hz more depth & then his bass response nose dives practically
instantly. If you are sourcing samples before 1990 then you could probably get away with them. But after that,
anything with depth & you are totally trying to guess what the bass is doing.
See:-

However,
Bit the bullet & got the HS Subwoofer. Totally different story. Utterly gorgeous & luv em to bits.
The Sub is way too expensive though, got min off ebay & still not cheap.
HS50s on their own now gives you a consumer mix perspective, so they become quite handy then.
Good luck with your monitor quest, you will very much need it
Have a friend with Passive KRK rp6's and a good hifi amp, he seems quite content.