In reply to Steve Perry:
Thanks for drawing attention to that.
I've not done it, but looking at the route map, and knowing the top half reasonably well, I can see why they've billed it 'the mountain connoisseur's route'- Heads of the Valleys onward.
I think its' a bit of a disappointment that it starts from Cardiff - Maybe once you've begun from there it helps to spur you on your way. As the Irish would put it: 'it's a good place to come from'.
As an alternative start, there's a roman road 'Sarn Helen' ( not always traceable on the ground) that runs a bit further west than Cardiff and ends just short of Conwy. But I guess you cant really avoid the M4 conurbation down there without going further west still.
It hasn't yet received the same publicity as Offa's Dyke or the Glyndwr Way.
I imagine that the final day's walk- leaving the high Carneddau and winding down to the town of Conwy would allow a contemplative frame of mind and the sight of the castle in the distance as an end.
Added bonus in Conwy is the Albion pub and a cracking chippy.
I've been eagerly awaiting a munros trip report. Maybe for this trip you could do a video diary in the style of your winter Crib Goch youtube one?