Admittedly the 20% damage taken is a threat, especially with high-power bots, but the speed IMO, outweighs the downsides. Especially when dealing with tanks, where it's a problem of pure DPS, and DPS isn't just about how much damage your weapon does, it's also about "Downtime" such as reloading (Which is why reload speed is so important), or time taken to grab more ammo, or making a mad dash for the bomb carrier.



Most of the time, I see robo-spies sap the sentry, while dispensers and teles placed off from the sentry area (Necessitated by sentry busters) are left alone in favor of more stabbing due to the way the spybot AI works, as the Sentry, to be blunt, isn't the main focus of the engie, it's only really an emergency item, you'll definitely feel the lack once the situation pops up, but you'll be slightly better overall at your job if you pick up the Powerjack.



So in the end, it's a question of versatility vs. efficiency, and I argue, in this situation, either is useful, there's no "One true build" for every slot.



But the Powerjack's head is bigger, and therefore better than the homewrecker's head, the Maul on the other hand.