Some on the nucanoe forum use the anchor lock,and have good reviews with it,I will be installing one on my yak at some point.i personally do not care much for the claw style anchors,having tried a variety of anchors,honestly the bolts hold me much better than the variety I've tried.
The claw type held me in most conditions,but you must secure the anchor rope to pull loose in the front,and lift from the rear in case of a snag.A section of heavy chain ,located near the anchor eyelet is required to tip the anchor forward in order to increase gripping power.Be sure to check out the claw type varieties,some are better than others,and all do not require a weighted front.