For problems with handling noise on a boom, a key point is to pinch off and isolate a loop of slack cable along with the microphone, so that the mike can float and (if necessary) wobble freely within its suspension without its motion being constrained AT ALL by the cable. Otherwise, vibrations enter the microphone through the cable--to a much greater extent than you would probably suspect.
Shock mounts such as the Shure rubber donut, the Sabra or most Chinese knockoffs of the Schoeps A 20 are fairly useless in practice because they don't allow you to do this.
--best regards
Absolutely right about the importance of a slack loop, but I completely disagree with your statement about other types of shockmounts being useless due to the lack of a cable attachment point.
You simply get a velcro wrap and tie off the cable with a proper size loop at some distance underneath the mic mount. In fact, when I have used Rycote INV mounts with the integrated cable clip, I still attached the cable this way because I prefer it to be attached to the stand a few inches below the mount itself. This allows you to make a larger / gentler cable loop, and reduces the chance that any part of said loop contacts the outside of your shockmount because the cable is "branching off" from a straight path to your mic at an earlier point.
The presence or lack of an integrated cable attachment clip on the shockmount itself should have no bearing on judging the effectiveness of the shockmount. You still must dress your cables properly, and as long as you have done so, the integrated clip is a non-issue.
In addition, if you attach your cable as I do, those short and thin hopper cables such as the ones sold by Rycote and Ambient are unnecessary, unless they need to wind their way through tight spaces in a basket-type windscreen such as a Cyclone.