Best breast pump?

Hey ladies, I figured it would be best to ask some other mums who are experienced with this regard. I just had a premature baby and I am pumping my milk for him, but unfortunately the hospitals don't rent out any pumps like they used to. What's the best pump to buy? The main things I'm looking for is that it's not painful, it extracts the milk well and isn't too slow, and that it's durable as I'll be using it and pumping exclusively for a few months at least.

Which pumps do you have, which would you recommend, what are the pros and cons, and any other comments. Thank you in advance for your help and advice!