I don't believe it's a fad at all - if it is it's getting to be about 120 years old and still running. The increase of Guide guns for sale is probably because as the caliber's popularity is on the uprise, and the ability to load for the .45-70 is being recognized, more longer barreled versions are replacing the guide guns. With a right proper heavy load the Guide gun can be shocking to shoot, a pounding 70 ft/lbs with agressive barrel lift. Truth is, what other caliber on earth can be a hoot to shoot at gophers with open sights at subsonic speeds (kicks like a .22 at those loads) be turned around and loaded to flatten the biggest bears, Cape Buffalo, rhino, whatever, in their tracks. Once you've played with the lever guns, there's no going back. I have a lot of great modern rifles, but I sure do love my XLR .45-70. The guide guns are designed as short range dispatchers - great choice in tight quarters at close range. When needed, you won't notice the recoil and whatever you hit will most certainly have a change of opinion about where it wants to be! After all, with the right load you're very close to approaching the effective power of the .458 Win Mag, one of the most powerful and effective dangerous game calibers ever invented.