My onboard flashes have never really failed, on either my DS, K100, or K10, although my K100 flash would stick and you'd have to smack it to get it up or to get it to stick down!!
IF you'd like to talk about flash units, both of my 360s have either broken or failed (one did both - they have both broken at the foot of the flash), and my 540 failed. Both were within the warranty period but I had to FIGHT to get my 540 covered (and it took about 3 months), and I'm still waiting for the repairs on mny 360, which Pentax will not cover because I can't find my documentation. All in all, I'd say DON'T BUY A PENTAX FLASH UNIT!!!!
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