I've run into 2 problems using the SNES Everdrive so far and they ended up being
1. a ROM problem: I patched Front Mission Gun Hazard and it wouldn't load. I figured I did something wrong while patching, so I unpacked it again and patched it again. Same problem. So then I decided to read the readme and it stated that the ROM must have a header and it even went on to specify how many bytes it should have. The ROM was indeed byte deprived and I used the recommended tool, SNESTools, but it didn't work. I then found NSRT and it added a header to the ROM, which allowed it to load on the Everdrive. I've patched a lot of SNES ROMs so far and this was the first anomaly.
EDIT: Rockman & Forte is also lacking a header. All the ROMs I'm discussing are from the supposedly pristine and perfect NO-INTRO sets. If you want to play Gun Hazard and Rockman & Forte on a real SNES through the Everdrive, you'll have to add a header to the ROMs.
2. lack of research on my part: Jikkyou Oshaberi Parodius wouldn't load. It's not one of the games with a custom chip, so I thought, and I guessed I had a bad rom. I did some checking and this game does have a chip! I never knew the list was so big....
Not Compatible with SNES Everdrive:
Metal Combat: Falcon's Revenge OBC-1
Daisenryaku Expert WWII: War in Europe SA1
Derby Jockey 2 SA1
Dragon Ball Z: Hyper Dimension SA1
Habu Meijin no Omoshiro Shōgi SA1
Itoi Shigesato no Bass Tsuri No. 1 SA1
J.League '96 Dream Stadium SA1
Jikkyou Oshaberi Parodius SA1 (I might just buy the game if no firmware upgrade is released.)
Jumpin' Derby SA1
Kakinoki Shogi SA1
Kirby Super Star SA1
Kirby's Dream Land 3 SA1
Marvelous: Mouhitotsu no Takarajima SA1
Masters New: Haruka Naru Augusta 3 SA1
PGA Tour '96 SA1
Super Robot Taisen Gaiden: Masō Kishin - The Lord Of Elemental SA1
Mini 4WD Shining Scorpion Let's & Go!! SA1
Pebble Beach no Hotou: New Tournament Edition SA1
PGA European Tour SA1
Power Rangers Zeo: Battle Racers SA1
SD F-1 Grand Prix SA1
SD Gundam G NEXT SA1
Shin Shogi Club SA1
Shogi Saikyou SA1
Shogi Saikyou 2 SA1
Super Bomberman Panic Bomber World SA1
Super Mario RPG: Legend of the Seven Stars SA1
Street Fighter Alpha 2 / Street Fighter Zero 2 S-DD1
Far East of Eden Zero SPC7110
Momotaro Dentetsu Happy SPC7110
Super Power League 4 SPC7110
Hayazashi Nidan Morita Shogi ST011
Hayazashi Nidan Morita Shogi 2 ST018
Star Fox / Starwing Super FX GSU-1
Stunt Race FX / Wild Trax Super FX GSU-1
Vortex Super FX GSU-1
Dirt Racer Super FX GSU-1
Dirt Trax FX Super FX GSU-1
Super Mario World 2: Yoshi's Island Super FX GSU-2
Doom Super FX GSU-2
Winter Gold / FX Skiing Super FX GSU-2
Star Fox 2 Super FX GSU-2
FX Fighter Super FX GSU-2
Comanche Super FX GSU-2
Powerslide Super FX GSU-2
Super Mario FX Super FX GSU-2
Nothing above really bothers me except for Parodius. I already beat the hell out of Starfox when it came out and I have a minimal to moderate interest in the others.
SD2SNES Compatible:
Dungeon Master DSP-2
SD Gundam GX DSP-3
Top Gear 3000 DSP-4
Mega Man X2 / Rockman X2 CX4
Mega Man X3 / Rockman X3 CX4
Dai Kaiju Monogatari 2 S-RTC
F1 ROC II: Race of Champions / Exhaust Heat II ST010
Star Ocean (Uses S-DD1 to decompress, but due to SD2SNES' 128MBit ROM Limit, you can run the uncompressed ROM)
SD2SNES Compatible or Super Everdrive with DSP-1
Armored Trooper Votoms: The Battling Road DSP-1
Bike Daisuki! Hashiriya Kon - Rider's Spirits DSP-1
Final Stretch DSP-1
Lock-On / Super Air Diver DSP-1
Michael Andretti's Indy Car Challenge DSP-1
Pilotwings DSP-1
Shutokō Battle '94: Keichii Tsuchiya Drift King DSP-1
Shutokō Battle 2: Drift King Keichii Tsuchiya & Masaaki Bandoh DSP-1
Suzuka 8 Hours DSP-1
Super Air Diver 2 DSP-1
Super Bases Loaded 2 / Super 3D Baseball DSP-1
Super F1 Circus Gaiden DSP-1
Super Mario Kart DSP-1/1B
Ace o Nerae! 3D Tennis DSP-1A
Ballz 3D DSP-1B