Sadly, the (much better than 40S&W) 41 AE is getting a wee bit tough to find ammo for (I'm one of the last).
UZI has a conversion kit for the 9mm version. Cases are the biggest problem right now.
Speer used to offer a 180g Gold Dot bullet that could be easily loaded to 1030fps - IMO the finest semi-auto defense load. Speer discontinued.
Sierra offered a 170g meant for the 41 Mag; a bit 'tough' for the 41AE, but still not bad. Discontinued for a while, but available again.
Better ballistics than the 40, bigger hole (a true .410"), lower pressure, and a barrel, recoil spring, and some mags - you're shooting from a 9mm platform.
I've made a considerable amount of this caliber (got hooked up with UZI shooters; boy, can they go through ammo!) but am now having difficulty getting virgin cases (no real big deal; I don't get many requests for this caliber).
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"All my ammo is factory ammo"