Should I pull the trigger? (from hertz)

Been in the market for a used prius for a while, came across a nice deal for a 2013 ex-rental fleet and wanted your opinion on the matter. (first car, family of 2)

specs:
2013 Prius II
ex Hertz car
55,000 miles
original warranty active (5,000 miles for the powertrain 45,000 for the hybrid)
hertz back their cars with a 12,000 12 month powertrain warranty
small dings and scratches which are not noticeable until closer inspection
its light blue green
clean title
back tires choppy (6 months left on them)
front bumper has a tiny crack which is not noticeable
price 12,200 (+ documentation should bring it up to 12,500 pre tax)

got it checked at a toyota dealership and they said the car is in great condition par the 2 back tires which may need replacing by winter.

we really like it but it never hurts to get opinion from the internet

uploaded some pix

 

thanks for the comments!
i also have the same concerns: alignment, back tires + rental fleet (though i don't see hooligans actively seeking to rent prii)
Hertz sells all their cars as is, so i'm fairly certain they won't entertain the idea. I'll bring it up and let you know if they bite
I think it will probably cost ~100$ for the alignment + 300 per tire at the dealership.

the price is attractive (around ~$3000 cheaper than from the dealers in this area [it's also cheaper than most of the craigslist listings in this area by ~$2000]),

Already picked it up for the 3 day rental, I'll post pics soon
super excited to toss an air mattress in the back and go camping

 

Thank you, I've been reading prius forums for a while but decided to join to get some advice and I'm glad i did!
I am new to cars in general... we're young profs just starting our careers, and we were hoping this could be our car for the next 5-8 years before we upgraded to something larger

they're choppy as in when I measure the tire at point of the tire it is less worn than another point on the tire..
you can tell that english is not my forte.. if we set a reference point at 0 degrees, the tread measures x inches and if we go measure the treads at 60 degrees it measures something much lower.

 

went out to view the back tires again...
the front tires are almost new.
the back tires are of another brand and it looks as if somebody has sandpapered a portion of the tire off.. (i assume there was a braking emergency where someone was forced to brake hard and a portion of the back tires were worn down)

its the airport dealership, the lady we dealt with was wonderful, (unfortunately they don't have a wire transfer set up so we're jumping through hoops to pay them in time [we use simple for our banking]) not to mention we don't have in-state license+ID (we thought we'd move out of state right out of college) so they're being very patient with us on all the steps

the toyota dealership told me that they'd give us until the winter to replace the back tires. I'm looking into midcitytire prices

 

normally i'd agree
but looked up the fuel economy in the past 6 months using the display, all months prior to Aug (wife's driving is at 40mpg) were mostly at 50MPG from the computer readout so i really don't think it was abused to hell (well not in the past 6 months at least.. and thats 6 months of the 28 months that it was active) and statistically speaking if the past 6 months were good i doubt the last 28 would have been much different