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Although they offer an "indexed" lever, this is really a friction system. For reliable indexing, there needs to be a mechanism to ensure a constant chain gap (gap between sprockets and jockey pulley), and this derailleur has no such mechanism. So even though the shifter has "soft" detents, the user will likely have to use the old technique of moving the lever a little to far so the chain grabs the next sprocket, and then back again to center the derailleur. It also appears that the the outer cage plate has a rigid extension behind the jockey pulley - this probably contacts the chain and helps to push it to the next sprocket, much like a front derailleur cage plate.
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