Rebuilt means they cut off the old joints and weld on new ones destroying any temper that was in the original axle. This is SOP on most rebuilt axles.

Our 123 axles are generally bullet proof provided the boot doesn't leak AND your trans is set to a proper shift setting. (not too harsh).

I'd rather just have a decent set of axles rebooted (I'll keep the original German joints).

2 hours is rather fast for replacing ONE axle (I've done it twice). The first time took me 6 hours including a shower afterwards and garage cleanup. I don't have a lift, its on jack stands.

I paid about $145 for one rebooted axle, that's about $65 more than a CarQuest rebuild. Mine time is worth that to avoid a redo.

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84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)