Personally I would rather have the individual crowsfoot wrenches over this.
And I agree with your 100%.
Line wrenches are often teh best solution, then crowfoots for obstructions, but there ARE times when the adjustable crosfoot is the only tool that will fit the job without spending the added time to modify a tool (and then the money to replace it)to work or add to disassembley and then assembly time to reach a fastener. Time is lost profit in the real world of wrenching.
It's a "specaity tool" and it proclaims to be nothing else.
But, say you don't have tool storage space for all of the wrenches, crowsfeet and ratchets, this tool will work. It is CERTAINLY no gimmick.
Trust me.
Don't buy one if you feel the need is not there, it does have it's uses.