You'd think right? But sadly it's not the case. The nes one at least has major dpad issues that result in unintended directional input (e.g. down often registers as down-left or down-right). It makes games like Contra very frustrating. The original controllers do not have this problem.
I have five 8bitdo controllers (2 SFC, 1 SNES, 1 FC, and 1 NES30 Pro), and only the NES30 Pro has this issue. I wouldn't say it's an across the board, guaranteed issue. From what I've seen and experienced personally, earlier models of the standard controllers can often have it but it's been (mostly) phased out with the more recent production batches. The Pro line still seems to be a shot in the dark though. That said, I'm sure they'd take a return/replacement if you're having issues. I'm hoping the new SNES30 Pro nips it in the bud when that launches.
Price out two of them. Thats almost a SNES mini.
If you're frugal, I wouldn't purchase them directly on Amazon; it's super pricey that way. You can get non-pro models on ebay, brand new for usually about 28-30 bucks. If you are even more frugal and patient, you can purchase them direct from China on Aliexpress for about 25 bucks each. I've even occasionally seen sellers with two packs for about 45. They aren't the cheapest, sure, but IMO they're worth the price if you will actually use them; of the like 5 different brands of reproduction controllers I've tried 8bitdo's are by far the best.