This film is a guilty pleasure of mine, which borrows heavily from the Richard Stanley film "Hardware" (both movies also feature actor William Hootkins).
I'd recommend this to all Brad fans and lovers of sci-fi/horror. However I would recommend getting the UK DVD, as this is much longer and uncut in terms of gore compared to the heavily truncated US disc, which is cut and misses out a lot of character development and sub plots.
There was also a much longer extended cut released on Japanese laserdisc (now long OOP), however this version simply contained extra dialogue, was slow paced and had no more action.
In short, go for the UK DVD as its the directors preffered cut.