HUDs still allowed?

Used to see a lot of people using HUDs when I played more online poker but I've stepped back a bit, mostly focusing on blackjack lately. Now I'm wondering if HUDs are still even allowed on most of the major poker sites. Seems like some rooms are really cracking down with tighter terms, but I keep hearing mixed stories about what’s actually enforced and what gets ignored unless someone reports you.

Curious what the actual experience is these days - are folks still running HUDs or have you moved on to playing raw?