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If a diff is welded correctly and with enough but not too much heat, it will never break. Also, slow cooldown is essential for dense, treated steel.
For anything over 30mph its tough to tell the difference from a decent clutch diff with average preload. Off throttle understeer at lower speeds is a small problem but for drifting there is really nothing better. The predictibility and consistency of a locked diff is unparalleled. The majority of circuit/rally cars in the 70's/80's and early 90's used spools instead of diffs for reliability under power. The 97 spec Impreza WRC used a welded rear diff over an active or clutch type due to its consistency and reliability. With carbon diffs and the advances in electro/hydraulic diffs its not really an issue anymore. Welded diffs rule!
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