With M I used the bassinet at night until she was 6 months old but I used her cot for her day sleeps to get her used to the space, she wasn't much of a co-sleeper.

With A we kept her in a bassinet for about 5 months and then she moved to the cot (pushed up to our bed with only 3 sides on) once M had moved into a toddler bed, A spends more time in our actual bed than her cot though even though shes at arms reach.