It might help, from what we are hearing it is sort of a mixed bag... It helps some and some are fine with the upgraded one... It really is a try it and see sort of thing.
The baseband is installed at a lower level then roms and kernels, so it will not be touched when you flash a new rom or kernel, even if you wipe. The only way to change it at all is to flash a new baseband
(it also will not touch your current rom or kernel in anyway...)