What an odd PN and a great tip on something to observe. Took a look at it last night in an 18" dob and from +36 degrees dec is is down in the muck but did show the knotch in one end. I only detected the other end as irregular in some way. To me the averted vision view hinted at a dark lane through the middle but it came and went with it being so low.
Thanks for the suggestion as I like those two-for one type of objects with M46 being a grown up version of this pair. Found an APOD link to an amazing pic of 2818 today and just like for M46s planitary of Ngc2438, this 2818 planitary is only an overlay superimposed from our place in our galaxy and is not from a member of the cluster itself. Still it is a nice set.
Here is the APOD link:
http://apod.nasa.gov/apod/ap090122.html
Clear Skies!