The Escape hybrid is an earlier generation hybrid and not as reliable as the Fusion nor does it get near the mpg. The Fusion is much more refined so really consider how often you really need that small SUV.
We had a 2006 Escape Hybrid, it ran fine (we had it for 66k miles) and my wife drove it 99% of the time - she would average about 26-28MPG and I would average about 30-33MPG (I try to drive smoothly for the best MPG), so if you want something with the better MPG then the Escape is not the way to go, but if you want a good small SUV there ya go.
I still see my 2010 Fusion Hybrid every couple months when I change the oil on it, I owned it for the first 145k miles and it's now owned by my wife's best friend, it now has 262k miles and still runs fine. The dealer offered the software updates mentioned in an early post but wanted $100 for each of them, I said no thanks the car is running well and so I didn't see a need to spend the $200 - that was 120k miles ago.
So I agree with lolder, I would take a test drive and see how you like it and make sure there are no warning lights showing and maybe go over to Autozone and borrow their ODB reader and see if they can check for active or stored codes (I don't know if their readers can check for these or not but worth a try). I would also check the 12V battery and see if it looks like the original battery (maybe there's a date stamp somewhere) and if so then it's probably a good idea to replace it on your timeline rather than have it go kaput when it's not on your timeline.