I won't attempt to review the films as that's been done already.
This package is great value despite the slightly tacky marketing. If you've never seen The Exorcist or The Shining or they are absent from your horror film collection it's well worth a look.
The extras are great, revealing on both the realisation and reinterpretation of two classic horror novels by auteur directors at the peak of their powers who push the technical aspects of film making as hard as they push their actors. Both films have been remastered into 5.1 stereo and look in great shape.
Be warned that The Shining is the shorter version that Kubrick cut down for the UK audience after negative criticsm on it's US release. I'm personally undecided as to which version is better, having seen them both.
The Exorcist is likewise the shorter Theatrical version, but the cut scenes are on the extras side of the two sided DVD. Again, I'm not sure that this isn't a bad thing.
I'd certainly recommend anyone interested in the evolution of the horror film to check these out. They come from an era of high budget horror film making from before the slasher genre became so dominant, and both offer rich subtexts to be mulled over whilst succeeding as glossy entertainment with a few shocks and scares along the way.