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I have the SWD version and the 300f4 rather than the 40-150, and assuming the Pro lenses perform similarly I have to say the 50-200 is a great option. With the MMF-3 adapter it's a bit larger but you get longer focal length as well. AF is almost as fast as the Pro, and with the EC14 quality is still excellent.
I haven't used the non-SWD but I think I read Oly won't service them anymore as they're quite old, you may want to verify though.
The downsides are weight and no compatibility with other m4/3 bodies except the EM1.2.