I've recently stumbled upon Super Everdrive and I've been re-visiting the SNES library for the past week week.. And I've realized something pretty shocking. With Hindsight, The SNES has a pretty terrible lineup of games. It was a goldmine for jrpgs, first party stuff, and the superior arcade ports (sf2*, mk2-mk3), but 3rd party support was TERRIBLE
. I would go even as far as saying that the NES had a more versatile line-up for its era. The NES has tons of action platformers and arcade style action games, while the snes took a serious turn toward rpgs, sport games and mascot platformers.
During those days, I was such a snes fanboy, but I was blinded by the graphics I guess 
I was actually looking into getting a Super Everdrive; any reason you got that over the SD2NES? Have you experienced any drawbacks?
I went for a Super Everdrive China Edition. It's the cheapest option, and it works really well. It seems a bit finicky with SD card, but I don't know if it's a problem with the cards I tried it with. It wouldn't read my standard kingston 8mb card at all but it works perfectly fine with a lexar. Mileage may vary. As long as the card is formatted in fat32.
I paid 125$CAN for it, but I've seen that you can get it for much cheaper on ebay if you order from mysterious asian resellers, i've seen it for 70 Trumpbucks.
Just googled around, and legit sd2snes seems to be around 160-200$ depending on the options? With the exchange rate, it's getting kind of expensive.
You put the roms on the sd card using Windows, so no need for crazy weird finicky software, which is fucking GREAT. I've owned a lot of copiers for various consoles and handhelds over time, and to be able to do this without some super crap software with Chinese error messages is liberating.
The only drawbacks is that the Super Everdrive China Edition doesn't support any special chip at all. So Forgat about Mario Kart, Star Fox, Doom and other games that used special chips. There are lists out there that show you what works and what doesn't. It's no real big deal to me personally.
One small annoyance is that you can only flash ONE game at the time into the cart. You can't have a fancy menu with 5-6 games that you can quickly boot to. But I think the sd2snes is the same for this.
Also, when you flash the game to the memory chip, it might take a minute or two. It will erase the previous game, flash the new, and then it convert the save game format to its own, thats actually the longest part of the process. It might take a minute or two, sometimes it's very fast. It depends on the game.
But once its flashed to memory, you can boot straight into it, and when you reboot the snes, the game will be in memory.
There's no game genie support.
My main interest was to try translated game on the real hardware, betas and prototypes and all the cool hacked stuff. I did run into a few proto/beta games that would boot to a black screen, but that's it. I never had any issue with retail games or translated stuff.
It's worth the purchase. For the price, you can't go wrong. It's really fun to try those BS SatView games on the real hardware, and I love fucking around with beta version of games.