I like the Aliens rules but Gunmaster provides an at least equal level of realism while flowing much better and is far superior in areas such as character generation. I converted the rules to Gunmaster.
Having said that I'd still be prepared to run the Aliens rules as they are. If you are familiar with Phoenix Command you won't have any problems with the Aliens rules. If not you might take a few read-throughs and play tests to get your head around them.
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 "It is better to be feared than loved" - Nicolo Machiavelli
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