Hi Terry,
Very nice Essence 6 string. I have a fretted 6 string Europa (thru-neck) and a fretless 5 string Epic (set neck). Both have sustain for days. The Epic actually has a hotter output based on the same amp settings. Maybe pu height has something to do with it, but string height is about the same. I find the set neck Epic has a very warm mid-range tonality, while the Europa thru-neck is very bright, but this might have to do with the different woods: Epic has mahogany body with wenge top and maple / ebony neck, while Europa has mahogany body with quilted maple top, and maple purple heart lams /ebony neck. You should let your ears be the judge. Also, the set-neck Alembics may not have the bridge block which also contributes to sustain. Anyway, an Essence thru-neck should be a little more valuable than an Epic or Orion set neck model - you might want to negotiate trade plus cash?
Happy playing.
Keurosix