I too just used the cot for my first 3 but on impulse bought a cradle for number 4. We used till she was almost 5 months and the only reason we stopped using it was because she was a wriggler. and would wriggle up to the edges so I thought a cot would be better and so far it has been..

so yes i think bassinets or cradles are a good idea.. A lot depends on the size of the bassinet though.