Rob , I think those are very good prices You've been offering - better than the private guys (a guy up here wants $3200. for a 4000) so 3k for those 2 - 4500's was xlnt. Already from reading you guys around the forums (1500 good on extreme as well) when I do add to quiver ~ I'm pretty sure i want that Coil splitting feature, which i believe ya'll said started on the GPX 4000. I like the math You showed for halving the DD in inches as a Mono as well. Seems like less need to switch coils in extreme blacks or normal friendly soil, if i'm thinking Straight so far ? either way on how i eventually work one in , Your the man i'd want for an Instruction Sessions & would Compensate You 4 Your time, if so Possible. Thanks & Talk soon - Ken