I have the Metz 48 af-1 and really like it. I've done bounced flash with it off a side wall and ceiling and thought it came out fine. I can't compare it to the Pentax flashes, except to say that the 48 has both swivel and tilt, while the Pentax 360 only has tilt.
One of the best features of the Metz 48 is that in manual, one can adjust power from full down to 1/128. I've been experimenting with some strobist scenes, and i''ve been finding that low power is very useful at times, and not something i can get with some of my older pentax flashes. Also, the Metz flash has builtin flash compensation thats in addition to that in the Pentax camera - useful feature i think. Adjustment screen on back takes some getting used to, but is find once you use it awhile.
I don't do weddings, but if i did, I would get the higher power flashes from Pentax or Metz like the 58.
Off the topic a little bit, but i recently purchased an Alzo Porta-flash soft box
Studio Flash Accessories by ALZO digital
it's easy to carry around, relative to an umbrella and i would think the wedding guys would find it useful, but weddings are not my thing - one will last me a lifetime :-)
best wishes,