I bought 16 x 300AH/3.2V LiFePO4 cells and took delivery in April 2014.
Being Chinese, and being unfamiliar to me, I only got a 300AH/48V "nominal" bank to test the water with.
If I'd known then what I know now, I'd have just got 600AH worth from the start.
When I went back to get more, the company was uncontactable. Not sure if they went bust, got bought out and shut up, bought out and tied up to supply to one company only, or what.
My next batch, almost a year ago, was also LiFePO4, and made as 16 series packs, each pack being 3 parallel 200AH cells. So 16S3P, for a second "600AH/48V bank".
I very rarely see them drop below 53.0 volts, even after running the house and everything all night.
Under charge and "floating", they sit at 55.5V
So they are very "stiff".
I'm discharging them typically down to about 75%-80% overnight.
I haven't had any "superior" (allegedly) American cells to compare them to, however I know at LEAST one american seller sells the chinese cells as "american made", so don't let that fool you. I've heard good and bad stories about most cell technologies. My own experiences are that LiFePO4 is probably the best of the currently available technologies and I wouldn't hesitate for a moment going the same way again.