The biggest things to my mind that it lacks is cruise control and the 60/40 folding back seats. In the One level, the back seat is an entire bench unit that folds down. That doesn't kill me as much as the lack of cruise control. But I just noticed a dealer right by me selling a couple thousand under MSRP, too. And I find it weird...they're not known for their customer service, so I'm guessing they make it up in weird fees and whatnot. Doesn't mean I'm not going there to do a test drive.
No cruise control or center console/armrest and single rear seat (non-split) so limited to two people if you need to fold it down for more storage. There are more: Toyota Prius c - 2012 Models: Prius c One, Prius c Two, Prius c Three, Prius c Four Good price but be prepared for hidden fees, add on charges, high interest rates, and/or low offer on a trade.
again, I'd like to see/find a photo of the bottom of the one-piece/One model's rear bench. (...looking...)