Metz AF 50-1

Got an opportunity to buy a Metz AF 50-1 flash for my K5. It's second hand but is said to be in excellent condition. At a price of £150 I'm tempted, but would feel more enlightened if anybody has any experience of this particular unit. Thanks in anticipation . . .

I have it and its good, but for that kind of price you are only £25 - £30 away from the newer models with touchscreen and a two year warranty...

Thanks Cabstar, I guess you're thinking of the newer 52AF-1? Cheapest I can find on the web is £200, have you seen it cheaper than this somewhere else? Or are you thinking of another model?