I've had pretty good luck with gear, but 20 years ago I bought a Tascam M-216
and I could never get myself to like the sound. I don't know if it really was all that bad or because the mixers I used before and after it were so much better in comparison. But it did something I could never accept to the sound.
In the 1980's I bought a MIDI merger called a YMM2 from Yamaha. It never worked right, and later I read that they never DID work right. So Mr. Yamaha, if you read this, you owe me $80.
For the last 10 years or so I've been using M-Audio keyboards. I've had 4, the current ones are
the MK-461C and
the MK-361C. I use them because they are light for gigs, the wheels aren't bad and it's got lots of assignable knobs.
But quality wise that thing is the worst garbage I've ever come across. It sets new ground for breakfast cereal prize construction. I've replaced 4 keys - they just broke off. And I've had the thing apart so many times it's crazy. I ended up buying a broken one 'cause the keys were costing me so much to replace individually. Compared to the repair history of the DX7S that it replaced... whew... but the weight of the Yamaha did me in.
Ableton Live is a useful program but dealing with them you feel like it's not a real company. For whatever reason they still don't make the program comply with the 1983 MIDI standard that every other company and MIDI product I have ever heard of complies with. They are on an island by themselves. Ableton Live does not recognize all the Control Changes up to 127 for instance, and Program Changes in the middle of a bar are mysteriously ignored (?)... stuff like that... and when you phone them... you get nowhere... they say "ya, we're gonna do that soon", and they've been telling me that for a couple of years.