I got lent a bassinet from a friend, I had already purchased a cot for DS room (next to ours).
But in the end, I don't use either at night, as DS co-sleeps in our bed. When he co-sleeps he will sleep for 4-5hr blocks, in the bassinet he would startle himself more and wouldn't sleep for more than 45min before stirring and wanting me.
I've just started putting DS into his cot for little day sleeps, but the bassinet hasn't had any use from about 3 weeks.

It is very good to have them within arms reach for the first 6 months, it reduces SIDS risk and also is great if you are breastfeeding. BUT I would hire, or check gumtree or ebay for one second hand, I wouldn't lay out expense on a new one, especially if you think you might try bed-sharing like I do.