I have a QLM30 MkIII and an XLM Improved MkII, both NOS, and I'm embarrassed to admit that I haven't tried either of them yet. The QLM is a heavy tracker and might go on an old ELAC Miracord eventually; the XLM needs a tonearm with much lower mass than any of the tonearms I currently own. Such a tonearm will probably come into my life eventually.
The QLM and K8 bodies are still pretty common and typically are very inexpensive. You can put an XLM stylus on them and you'll get very close to XLM performance.
I purchased an EVG 4108-DET stylus which is said to be a good substitute for original XLM styli, especially considering its price — I only paid $12 for mine. It's high compliance like the original and needs a low mass tonearm in order to shine.
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