Serviced or non serviced?

What is the general feeling about serviced pitches?  Too many? Too few?  Would you prefer one if you could get one? 

They often seem to be all together on the boring parts of the site and they arent actually any bigger than normal pitches. Plus the drains are grey water only. So for us they arent worth the extra money for what they offer on CC sites although we do choose them on some commercial sites where they have full drainage (some even have proper couplings as an option) and bigger pitches  so we then find them well worth the extra fee