The CAK-38 is an excellent design HS with two shortcomings. First it continues to rely upon a 60mm fan for its air source. The only 60mm fan that can deliver enough airflow to take advantage of the surface area in the CAK is the screaming Delta 38. Some day, more manufacturers will break out of that trap and design around an 80mm or even a 92mm fan. The second shortcoming is not unique to the CAK. It uses the clip style retainer. They are simply a cheap method of retention, with little thought given to reliability, ease of use, or common sense.
that, having been said, the CAK38 is up there near the top of the HSF food chain and should be an excellent choice for someone looking for a few more degrees of cooling. I would never consider it as a threat to the Glaciator or MC-462A though. The Thermalright SK-6 is very similar in design and perhaps a smidgeon better in cooling capacity.