It seems to me you are looking at apples & oranges.
The RCBS is a copy of the Harris bi-pod, and it is designed for shooting off of it and nothing else.
It appears they sell for about the same price as the Harris, who invented them, and the Harris is still the gold standard. ($200 range, same as the RCBS)
The MAKO T-POD is first and foremost, a front hand grip for an AR-15 with a railed forearm.
True it has tiny bi-pod legs that come out of the hand-grip, but it is nowhere near comparable as a shooting rest to a real bi-pod like the Harris, or the RCBS copy of it.
I think if you want a real shooting bi-pod, get the Harris or RCBS.
If you want a front handgrip that serves a limited role as an expedient bi-pod, get the T-POD for $90 bucks.
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