This is a great question K. and I'm glad you asked it. I'm due with my second and have been weighing what I want to do with this baby. After reading the responses, I think I'm going to go with the mini cosleeper myself. We had a bassinet with my son and as it was mentioned here, he woke up everytime I tried to put him in it. Good thing was it was portable. We could take him out on the deck in it, to the backyard, around the house. Therefore I think I'm going to get a moses basket too for doing things like this (got rid of the bassinet) and I want to get a sling this time. I had some wrap thing I never got the hang of so this is my plan: cosleeper for the bedroom, moses basket for around the house and a sling for carrying the baby with me.
By the way, if you look on Babies 'R Us website, the mini cosleeper is rated very high, 4.5 out of 5 with 58 votes and the full-size cosleeper is rated 4.0 with 56 votes. So it must be a good product. I'm excited to get ours. Best wishes with your babies!