I managed to install DR800+ and I must admit it's very interesting and new functions are really very usable. I really wish they developed those functions in original firmware.
Although it's great, I found it rather unstable
It freezes my device often. I generally read pdf's and device freezes sometimes when flipping pages or just opening a pdf book... Everytime it occurs, I need to "reset" device by keeping on/off switch for about 5 seconds and wait another 1-2 minutes when it's refreshing...