Boss DR880 Drum machine.
I had a little Boss 4-track (BR482 IIRC), the built-in drums sounded really good but with limited flexibility (you could only program the patterns they'd built in, no way to make new beats/fills etc). So I
assumed that their dedicated Drum Machine would make sounds as good as the built in module on the recorder with the added ability to make patterns.
I assumed wrong. What a total pile of sh1t. A £300 total pile of sh1t (as if insult really needed adding to injury :roll:). The BR482's drums sounded 1000 times better than what came out of the DR880. Sadly the place I bought it from went bust so I couldn't return it.
& to cap it all, I couldn't get the MIDI synchronization to work

so even if I can coax a tolerable sound out of it, it won't be precisely in time with the click track.
My 2yo son sometimes plays with it, I might move it into his room because I certainly don't want to see it anymore...