In my camera bag there is always a Metz flash. I don't use it often, but my M6 without TTL is very happy with it. Indirect flash (ceiling) also works fine, I never missed the costly TTL version.

If I were a busy 2008 press photographer trying to survive competition I would own a digital EOS with a dedicated Speedlight flash, that's a "fire and forget" combo that always creates good results, no matter how and where you use the flashlight, in darkness, as fill flash... good stuff, but that's for WIMPS.