Used car seat from a friend?

Liz
Mamas, I need your advice!!
My good friend is selling her car seat and asked if I was interested.
It's a Maxi-Cosi Prezi infant car seat (
https://www.amazon.com/gp/aw/d/B0083BQ0EI?pc_redir=T1) and it expires in 2019.
I know nothing about car seats, but she said this one is top of the line, and is rated very well for safety.
It goes for $249 on Amazon, plus she has 3 bases ($80 each), and will sell it all to me for $200.
My questions are:
1) is it really worth it? Or should I just get a new one (different brand) for cheaper? I'd likely register for one
2) will I really need 3 bases? How hard is it to switch a base from car to car?
3) I know buying used car seats is frowned upon, but if it's from a close friend, and I know it hasn't been in an accident, is it ok?
Thanks for your opinions, mamas!!

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors