I just installed it. I really don't see any improvement over the 3.2.xxx that I had installed. Looks and feels like the same crappy software it has always been. If anything they made the Reader Store more difficult to read with a terrible font choice. It looked like a bitmapped font that had been zoomed beyond its compacity to look good. The font is very ugly and is not smooth. Way to go Sony, screw it up even more!

Sony really needs to trash this software and start over from scratch. I'm sure glad I made the switch to Kindle. I was going to keep my PRS-300, but I really don't see much point in that with such lackluster customer support and crappy software.