I bought a Mesa Boogie once, believing it to be the greatest amp of all time. Always fiddling with the many knobs and sliders trying to no avail to get the sound I wanted. Then one day, spotted an ad from a guy that had a Twin for sale and wanted a Boogie. Went round his house, plugged in, and there was the sound I wanted! Got £100 in cash as well. Deal done! Used that amp for several years until my age made it hard to carry. (Not a '74 though, a '68 reissue).