On short day flights, e.g. Boston, I prefer WT+ to Club World, as I find the seat better for using a laptop.
As I am used to a C seat pitch of 34" on 3-3.5 hour flights around Europe, 38" and a wider seat is ample on a 6-7 hour flight, when I have work to do.
I am probably one of the few people who politely declined an upgrade to J for this reason, the US check in agent looked as if I had gone mad
I accept that I am probably in a minority in this respect and for an overnight flight I very much prefer a flat bed.
Although I have never used PE, it does sound as if it is a very good product with the new seat and I would seriously consider it were I looking at a Boston/NY trip.