I have never tried them nor will I ever. I simply don't waste money paying to find out who someone thinks is going to win a game.
If they are truly hitting 73% in hockey, good for them. However, most likely there is a catch. Either every game they play is a -200 favorite or it is just another case of false advertising.
There is one thing I have to say about JHsportsline.com. They really need to spend a little of that cash they have been "winning" on improving that web site. It is attrocious. Black backgrounds! Monster size fonts! Low quality images. Looks like something straight out of web page design 101. They better put some serious effort into cleaning up that look if they want to be taken seriously.