They list the RR XL on the web site as 14" deep. Yours looks so much bigger???15x15 is a good size.
It'll offer similar "usable" footspace to a .5. I know this because I use a .5 and an OOAL Ridge Runner XL.
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With the .5 you get a little more distance from the tree and a built in knee rest and seat; but the saddle platforms are easier to work around the sides, and more compact packing overall. I can fit the RRxl inside a backpack.
I also have a Kuhnert's Ambush. It's no thicker than the .5, and nearly a couple pounds lighter I think. It flexes more and is trickier to set up consistently compared to the .5.
I like the way the .5 carries sticks, as a system.
So, pros and cons.
But 2.5 lbs is another league compared to these options. Folks have that much weight in accessories on bows, lol. 2.5lbs is light enough to change how I'd pack my gear. For reference, my old Fanatic Jacket weighs about 3.25 without the hood. I'd be comfortable hauling 2.5 on the back of a pack, when typically my platform/stand is the closest thing to my back.
Although a well made 2.5lb platform of this dimension would be great in many systems, it would be a luxurious "minimalist" setup paired with a low bulk climbing method like 2TC. Usually I have a destination in mind, so dragging a stand/XL platform in is fine. But, with reduced weight, I might be more apt to scout-and-hunt more. Current platforms of similar weight, 2-3lbs, don't offer enough real estate in certain scenarios. This dimension hits a sweet spot.
I think 15"x15" is money.
What does it weigh?