Metolius' sturdy U-shaped frame on the Power Cams and TCUs (four-cam and
three-cam units with similar designs) helps protect trigger wires and
keeps them from tangling with the rest of your rack. The trigger
action is smooth and precise, and you can grip the knurled bar in a
variety of ways -- of the cams in the review, these were the easiest to
slam in from awkward stances. Once placed, the Power Cams' four-cam
design is comfortingly stable, with very firm springs holding the cams
securely in position. Aid climbers appreciate being able to clip
directly into the bottom of the U-stem when high-stepping. The nylon
slings are beefy and brightly colored, making it easy to discern cam
sizes.
Power Cams and TCUs are not as adaptable to shallow horizontal cracks or
angled and diagonal placements as some ultra-flexible single-stem designs,
but for most placements they're reliable performers, even in the tiniest
sizes. Though a heavy load can bend the outer cables into awkward
shapes, a bit of massaging usually restores them to working order.
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Constructed with the same design as Power Cams, TCUs boast
many of the same advantages as the four-cam units but have a slightly
narrower cam head. The trade-off is that TCUs pivot around more than
their four-cam brethren. Like the micro-sized Power Cams, the cams
heads are made from durable 7075-grade aluminum.
Power Cam
Results:
Stability: 4.5
Trigger design: 4.5
Tricky placements: 4.5
Final Score: 
TCU Results:
Stability: 4
Trigger design: 4.5
Tricky placements: 4.5
Final Score: 
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