JithinSK, thank you for such nice words :
MotoManiac, It's entirely a personal choice, people usually believe what's new is the best. It's logical to think that the later firmwares were more fine-tuned to the ROKR hardware than that of E398. Since 1ER was the first ROKR based firmware and was equally unstable, no wonder Motorola came out with a quick fix and release 42R. One more reason to adopt 42R is because it's recommended for any 372->373 conversion.
People say 49R is the best. The fact is that, it's the "best" cause it's the most researched firmware of them all, credit goes to Electro. Had he done that to 42R, people would've thought just otherwise.
I'm not saying this to prove my point, just try it and see for yourself.