in most cases, extended versions are way better than original cuts because they add scenes which enhance the experience, answer some questions, explain few things and usually fit the film so well that one has to ask, why they were cut out (i felt like this when watching aliens extended cut for example).
in case of of alien, except of the cocoon scene and some alien shots before parker´s death, there aren´t any memorable scenes missing. distant images of the planet or nostromo are expandable, imho.
the tempo of the virtual workprint is ssssslllloooooowwwwww indeed, so i fully understood why scenes were cut out, also if you see more of the alien, you don´t get so frightened...
i knew the score of mr.goldsmith´s very well since i listened to it many times before. themes added to this cut are sometimes well out of sync with the picture, but i see the purpose and still it is very interesting to listen to the music and watch original-audio-less scenes...
finally i want to thank meedermow 1st for the work he has done with this release, 2nd for sharing it with us all and 3rd for future releases that are under development already, i´m sure
i´m looking forward to your impressions...