AFAIK, all the consumer/SOHO laser printers are dual-pass.
We've got a couple of Lexmark lasers at home (MS315 and CS410) which default to double-side printing (via putting the paper through twice). They work fine.
I've got an old huge Lexmark T522 in my office that has a bad problem with jambs when the humidity is low (just about any time from October - March). It doesn't do duplex...
Maybe they have better rubber on the rollers now, or something.
As you say, YMMV. :-)
Cheers,
Scott.