the pics you saw previously posted were of an early aluminum prototype, more for testing the base and folding mechanism than showing what the final legs would look like.
it might look big in the pics, but it really isn't when you handle it on a rifle. except for the leg swivel mechanism, it fits into a lower profile envelope than a harris sits in, when mounted on a rifle. it folds flush to the rail, and the lowest portion of the bipod when folded is about an inch. the lower point on my harris, with rail adapter sits about 1.8" below the rail. the front end is the widest part, of course, but it's more compact in person than in the pics.
the weight is about the same (it *might* be a bit lighter, but we'll have to wait for final numbers from TD) as a comparable S-type harris with rail adapter. note that it traverses - something the harris doesn't.
attachment is a conventional clamp with two cross bolts.
if you use a magwell hold, you can just mount the bipod with legs facing front, like you would with a harris. you can neither use a magwell hold, a vertical grip, nor a comfortable conventional grip with a harris mounted in the same position with legs facing back.
i've used the harris (on hunting and bolt rifles) for at least 17 years, and they're great (except when you sling the rifle and get poked). then i used them on 20" ARs. but the harris is a universal bipod; the TD is specifically designed around the M4/M16 system. and for that system alone, i think it'll be a very good alternative. i'm not trying to convince anyone who doesn't have use for bipods on a carbine or longer AR, but present info and preview a new product for those who do.
cheers,
MM