HEre is the list of changed parts between the B44 & B44.1
I've just received my B44 and

http://teamassociated.com/pdf/cars_a...conversion.pdf

Looking at it, alot of it seems to be for conveninece / Lipos.

-The chassis doesn't need cutouts for cells so they're not there.
-The front tower had cracking issues so lets make it thicker
-Need something to hold the lipos in so lets make a new tray and cool carbon fiber battery hold downs.
- Upgraded motor mount is nice
-Moving the servo closer to the centeline must handle better. I may drill two holes in my B44
-

From what I've read, the B44 is just as good.
I'm not upgrading mine. Of course, I'm not very good at driving and it wouldn't make a huge difference.