My flat bar road bike had a suspension seat post. It didn't cause me pain, but I gave it the nickname "Power Sucker" as it robbed power from my pedalling. I removed it, as I got a great deal on a carbon seatpost from my LBS. A million times better without it.
- edit, I think also with a suspension seatpost, you kind of have to set the seat a bit higher than you might normally, to account for compression of the post when you sit. I'm not sure, but you may want to get the fit checked at your LBS. (or...just toss the post for a rigid one).



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