Since 2002, I've been roasting about 5 half-pounds per week. My fifth roaster needed $600-$1100 for repair or replacement, and I looked for a low tech,inexpensive replacement. I can see where a machine with a circuit board, moving parts, and high heat has expense and longevity issues.
I found the SCR-300 (301 is 240 volt model). It is essentially a hot plate with a rheostat and turntable motor that spins two arms back and forth. I have completed about 50 roasts with it and am satisfied with its output. I roast outside and just into second crack - takes about 23 minutes.
My last two roasters had more difficult clean-up processes - the SCR-300 clean-up takes about 1 minute.