For anyone looking for pics of my newly modified seat by John Moorehouse (Ergo Seats), I took some, but after looking at them I decided that they weren't worth putting up as both sections look almost identical to the stock seat profile. This is because John reused the original covers and they are now really tight. The difference is in the feel of the seat.
I had a small problem with the rear seat in that it wouldn't go all the way down on the frame, he'd built it up too much at the front edge so that it wouldn't slide down behind the front part of the seat. I called him, took it over and he fixed it on the spot, took about 20 minutes all up. The seat now fits perfectly.
From a comfort point of view the seat seems to be getting more and more comfortable each time I climb on the bike, now whether that is wishful thinking on my part I'm not sure, but it most certainly feels different, more like you are sitting 'in' a seat rather than 'on' a seat. And it changes the way your body is oriented to the bike itself, which will take a little getting used to. On the ride back from Johns it became clear that, because of the change in the profile of the seat, my bum now sits farther back on the bike which tends to stretch my arms a little forwards, so obviously the next farkle required will be bar-risers to bring me back upright again.

My mate had his VT 400 seat done at the same time as mine and then rode up to Townsville on it. His verdict after doing 870 ks on the first day was that whilst his bum was sore he thought it would have been a lot more sore without the seat mods. He's leaving Townsville to come back today, so I'll get his updated opinion once he gets back.
If anyone is considering this farkle, I would highly recommend it, anything is better than the board that Honda laughingly all a seat on the 1300!!