EDP = 3lb 13oz (at 13.5" x 13")
Tethrd Knee pads = 18oz ; Arcteryx = 8oz; Lattitude/Alta = 12.5oz
.5 = 5lb 11oz (at 16.5" x 23")
Seat pad = 5oz
Less than 2 lbs advertised difference in the bare platform.
Run the pad on the backside of the .5 seat, no knee pads needed. Using knee pads with the EDP could cut the weight difference practically to 1lb, depending on selection.
Yet the .5 offers 10" more length and 3" more width. I know I like that. Plus you got an added positional option, sitting, which can be useful.
From there, comparison will come down to your other components.
I suspect the .5 with straps / belt and a lightweight pack, such as the fleece packs @Topdog mentioned will weigh considerably less than the pack most would choose when running an EDP and cost less.
Running sticks, .5 integrates LWCG sticks in ways that are simple, quiet, and carry well. Efficient. Your pack?
Carry in your cold weather gear, that .5 shelf is nice.
But it's so expensive...or is it?
Price:
EDP = $170, Knee pads $70, pack...lets say $250 = $490
.5 = $500, pack $50 = $550
That's not to say the .5 is the best option for everyone or anyone. You can certainly build a lighter, cheaper, more compact set around the EDP.
But, the .5 offers some advantages the EDP can't and for most users the end result will be minimum weight and cost penalty, if any, and in some cases, a savings in either or both catagories.
Not trying to knit pick but just wondering why you went $250 for a pack with the EDP and only $50 for a pack with the .5?
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