I had an original piggyback given to me because the guy who bought it had so much trouble with it. Much the same opinion as those in previous posts. I use it for target (not maximum charge) loads for 357, 45, and 44. I like the flexibility of having the Rockchucker for rifle and the Piggyback for pistol. But it does require some patience and attention to keep it working smoothly. First and foremost, it needs to be kept clean. Second, it can be a mechanical nightmere if you're not a mechanical tinkering kind of guy. Working with finiky pieces of machinery was my job for 18 years so that part was never an issue.
Like I said earlier, mine was free. Your $70 might be better spent on something different. Even the Piggyback III might be a better choice if you're pressed for space, like I am.
One other thing, when I load a maximum 44 load for hunting, I revert to single stage and weigh each load.