First i have rendered some superb scenes in 6 esprite using 1 or 2 poser figures that dont blow esprite out water.
Well as i own 6 esprite and have tried esprite 6, inf 6 and xtream 6 on on a mates, friends comp as he is potty with money and spends like mad, earns to much money and writes freebie modules to improve pc games.
6 Esprite is a cheap cut down version of Inf as i have tried some poser scenes on all 3 programs and Esprite crashes and burns to many times and they made it single core only.
If you want do scenes it was designed for with odd poser figure in then depending size will work nice, butttt the render time is like a snail, as they made 6 Esprite cheapy cheapy cheap cheap as possible.
To be honest its a waste  of money unless you can afford 6 Inf or Xstream.
For small scenes use esprite but for giant renders i use p7, c5 pro and c6 pro, as 6 esprite cant even render those size scenes.
I have brought a scene into 6 inf and extream and render it but in 6 esprite it kept crashing out.