Taken for what it is, 'LifeForce' can provide it's share of thrills and the effects are quite good. Though Hooper is not as artistic in his use of the widescreen as I have seen, the proper framing adds a good deal more to this film than the additional 15 minutes. The quality of the transfer is, generally, very good. The image is prone to a bit more graininess than one sees in the better transfers but this is minimal enough to not be intrusive and consistancy is quite good. I was unable to detect any changes from scene to scene than might give away where that additional material was inserted.
Colors appear accurate and solid for the most part.
Brightness and contrast are very good, as is sharpness and detail, important because much of the action takes place at night. The audio is somewhat problematic. Though dynamics and range a better than average, the sound is often overly bright with an unusual amount of high frequency hiss. If you enjoy theatrical listening levels, you may find the audio on this disc less than satisfying. The Dolby Stereo soundtrack does, however, contain good directionality and a liberal and effective use of the surround channel.