My DeVilbiss 6.5 HP 80 Gallon has been sitting on some rubber machine mounts that are designed to be bolted to the floor (but never were) for about 10 years now, never moves, never walks and it would take a couple of hefty linebackers to topple the thing. As far as worrying about it tipping over...thats what the flex line is for!
I have seen machines bolted through hockey pucks many times before. It looks to me like a guys version of an old wives tale. Hockey pucks are for hockey and it is doubtful that they have any vibration absorbing capability. Besides once you bolt through them you totally defeat any anti-vibe characteristics they might have had. The photo of the IR compressor on the pucks bears explanation... in order to isolate vibration from a machine (in this case the vibration is a result of the reciprocating mass of the compessor piston), you need to UNCOUPLE the machine from the floor, not bolt it down solid...remember the poster said it was solid as a rock? Rocks transmit vibration pretty well. The small anti-vibration capabilities here are provided by the small rubber under the nut on the thunderbolt, which tends to isolate the bolt from the rest of the machine, not the hockey puck. Look at the design of true anti-vibration mounts or feet....They all UNCOUPLE the machine from the base while using either some sort of rubber or spring assembly to CONSTRAIN movement so that it can't walk away on you. Another example is the common automobile engine or transmission mount. In essence they are made up of 2 metal pieces, one piece bolts to the engine or transmission and the other bolts to the frame of the car, between them is bonded a piece of rubber. These mounts are specifically designed for the application but in essence they allow the engine to do its thing without being hard mounted to the frame. Some mounts actually contain a viscous filling that further helps to de-couple the engine from the frame. In any event a GOOD anti-vibration mounting will use a material that is BAD at transmitting vibration. A hockey puck is as stiff as... well, a hockey puck, not very good material for isolating vibration and once you have a bolt in contact with the machine that is anchored to the very surface that you want to isolate the vibration from, it won't make any difference whether you are bolting through a puck or a solid steel round.
Think gentlemen... that's why good antivibe mounts are kinda spendy and hockey pucks are cheap.