The Bjorn Travel Crib gives a bigger surface area than a PnP does. If he is a long baby it might be more comfortable for him since he will have more room to spread out. We LOVE ours and DD who is the size of a 3.5 year old still has a lot of room to move around.
There is a thread in the Bargains section about a deal at Kohls.
ETA: I think that the mattress on the Bjorn is a lot more comfortable than the PnP one. We use a regular mattress pad and regular crib sheet rather than the one Bjorn sells
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Mother to DD-A July 2008
and DD-B-November 2010