That Knobtronix kit looks fantastic - has anyone on here built one? If so, how long did it take and was it easy?
You can still pick up Kenton Control Freaks - they are heavy but really well made and Kenton still support them, I bought a pair of new fader boards a few weeks ago. Programming them is slow but you can get them to do more or less anything you like, provided you want some midi sent.
I also have a Kenton Killamix, which suffers from the worst name any product has ever had. It's really nice and the switching system works well allowing 9 knobs to cover lots of around. I really struggle with encoders in a gig setting though - they are not quick or slow enough and the vari-speed solution means that if you increment and decrement the dial at different speeds you end up in a different place. Fine in a studio, not at a gig.
Last, I just got a PC4. It's almost exactly the same size as the Electron boxes, 24 proper dials. Not quite as solidly built as the Kenton stuff but it looks decent quality.