Yep, a great little 80's sci fi movie, with a lot of humour. Robert Prestons alien character is very entertaining.
The early computer effects probably look a little dated, but it was revolutionary for it's time.
I also liked the sub-plot of the replacement Alex trying to cope with the rituals of earth teenagers.
Unfortunately, I understand the recent us Blu Ray is very disappointing in terms of pic and sound quality. Shame, a decent upgrade and remastering could have made this an essential purchase.