My turkey: Studiologic SL-161 MIDI controller back in the early '00s.
Probably a decent controller, but I'll never know, as the one I bought brand new never worked right.
This thing had a great Fatar keybed with aftertouch, but it never worked for more than a few days/weeks at a time.
I'd call/email with Fatar (who owns the Studiologic brand) and they'd have me to take it to some authorized warranty service center in Burbank, CA, where some dude would keep it for a month or 2 -- only to give it back still not working or only functional for a few more weeks. Each time it got it back it was missing more screws and creaked, rattled, and moaned more than before. Rather than just giving me a new keyboard after the first fix failed, they joylessly kept at, giving me a new theory or excuse each time (bad logic board, loose wires, etc), it until I finally gave up and binned it.
Fatar supplies decent keybeds for most other major keyboard manufacturers, but I now avoid anything they bring to market themselves. I hope others have had a good experience with Studiologic products in the 20+ years since?
Epilogue: A year or two after I gave up on that SL-161, I ended up working for M-Audio, back when HQ, R&D and warranty service was still all done out in Irwindale. M-Audio repair techs would just scrap and replace any midi controller with a problem that couldn't be quickly diagnosed and fixed. Sure it seemed kind of wasteful to have a trash bin overflowing with partially-working MIDI keyboards at the end of each week, but it was a necessary sacrifice for making sure customers stayed happy(ish) and didn't go through what I went through.