hi
my little boy has only ever napped in his vibrating chair,it reclines or adjusts to sit up at whatever angle you want it in, and it has a bar for dangly things. its also plush and quite deep so he couldnt roll out of it. he would (and still doesn't) nap in anything else, its also great as it has straps at the side so to move him easily from room to room. He also loves his vibrating and natural noise bouncer (i think rainforst is the new one by fisher price) which is expensive compared to some but does the trick. I tried everything with him but only the chairs will do, i too bought a moses basked and 2 stands, one for up and down but he didnt settle in it during the day. i was given my one by relative so cant help where she got it but i saw same one on ebay little while ago while looking for something else.
sorry if long winded but the chair has saved my sanity many times !!
good luck
amanda