My main beef with SheepShaver is that it has relatively poor compatibility. A lot of things cause it to simply freeze up. In fact, you could run Copland on it and not tell the difference.

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I hear that complaint about SheepShaver, but I've just never seen it. Granted I don't use classic Mac programs much, but I've never found SheepShaver on Linux much if any less reliable than a real Mac running OS 9. :^b

(The last OS X build I played with was buggy as a bait store, however.)