Official Pacesetters

How good are they? How reliable are they?  How consistant are they?

 I don´t mean RW ones either.  This is for the Seville Marathon and was wondering, if I were to run with the 3.30 pacesetter would they run at the same speed all the way to arrive at 3.30?  Assume they just plug into garmin and run - Do they run tactically with hills?

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