Active Speakers ?

What are the benefits and wich ones would you recommend (monitors and/or floor standers) ?
Thank you for your input.
This question is too vague for acurate recommendation!
For instance, there are active THX movie speakers(M&K P150's for example), studio monitors(Genelec, Westlake, JBL, Mackie,ATC,etc), full range actives (ATC,Linn,Avlar,others), Etc.
What are your applications, your room parameters, your source material, budget, etc, yada, yada?
Come on people!..more info! with us here!...don't just ask..."what's the best speaker?"...what's the best amp?"...Bzzzzzzzzzzt.
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