Mogul (Sprint): Question on upgrading ROM from 3.35.651.2 to 3.56.651.0

[bones20]

I haven't yet upgraded my Mogul to the latest ROM update. I am still running the 3.35.651.2 Sprint ROM. I am very happy with my current ROM with all the required software configured to the T. In this case, I was wondering if there is any benefit to upgrading to the latest ROM.

Sprint website says about the following benefits:
1. Upgrades the operating system from Windows Mobile® 6.0 Professional to Windows Mobile® 6.1 Professional
2. Adds Sprint TV
3. Includes all enhancements incorporated in previous software upgrades including:
EV-DO Rev. A functionality for faster download and upload speeds when utilizing data services wherever EV-DO Rev. A coverage is available
Advanced GPS functionality including the Sprint Navigation application
Adds a Task Manager to the Today screen for easier access and management of running programs

Out of the above, I already have sprint Tv and have both google maps and Iguidance working. So apparently, my only benefit will be task manager and WM6.1. I have learnt that it also adds threaded SMS support which is not something important for me as of now. Also I read a few reviews of WM 6.1 and most are saying that the upgrade is worth for smartphones not so much for PPCs.




Questions:
1. Are there any significant improvements in WM 6.1 over WM 6.0?
2 Will I be able to use my sprite backup archive of my current ROM running WM 6.0 and apply that to the new ROM running WM 6.1? This is an important one. If this is a no, then it will be a lot of work to get the phone to its current state
3. Are there any software compatibility issues in WM6.1? Do all the softwares and configurations work across both the ROMs? Any known issues?

P. S.: I already have the old Stock ROM RUU and my latest sprite backup. So it wont be a problem coming back to the current ROM