Unit won't play m2ts files, even when burned to AVCHD (recognizes the AVCHD, but then locks up and shuts down after about 30 seconds). It can't see the files from movie mode. .TS files are a no go as well.
Basically, the extra media features are great only if you have a blu-ray burner on your computer and don't mind burning a new disc everytime you have a file to transfer, or you're into watching highly compressed lossy movie files that are no larger than 4gb in size off of a burned DVD or FAT32 formatted flash drive.
In other words, they are pretty much useless on this and every other player on the market.
Don't let that detract too much from the unit however- I've had VERY fast loading times, fast and responsive menu operation, and great video quality. For the $199 I got it for, it's a CLEAR winner and a fantastic blu-ray player. I'll just have to get a WDTV for my other needs.
The remote actually has an intuitive layout, but no backlight means it has to go for me.