Prolabs is allowed as far as i'm aware. It's pretty much the same, you can set up the HUD to show you in game if someone is winning/losing, and you can even filter the results down, so it's like the SHarkscope hud but it's allowed. The reason i got was that pokerprolabs worked with poker sites
in the development stages, which sounds like total BS to me but whatever, it's apparently Legal.
And sharkscope is one of those things that apparently isn't allowed, but is almost impossible to police, use it away from games if your paranoid, but i've been using it for years with games running and know of a lot of people who do the same.