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I had one for a couple of years, probably about ten years ago. It's a very nice lens, pretty much on par with the SMC Pentax 200/2.5, and both are slightly bettered by the SMCP-A* ED 200/2.8.
Here's a quick table comparing vital stats for the SP 180/2.5, SMCP 200/2.5, SMCP-A* ED 200/2.8, and a more modern Canon EF 200/2.8L II. The SP is smallest by a fair margin.
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