we have a cot which bub wont sleep in, got a bassinette and wont sleep in it (even with the anti roll snuggler). Now bub will only sleep in her cocoon (which we put in the bassinette). our mw thinks that she feels more conforted in the cocoon cause it is smaller and more snug than the openess of the bassinette. so will stay in that until she i too big and move into bassinette cause i am sure cot will be too open just yet.
however we were alo never getting a basinette - we borrowed from a fiend - and it is great cause you can wheel it right next to whichever side of the bed you like in our room. which is good because it is too cold to walk around the house at 3am!