Depends on your taste on how it effects the sound.As a rule you would say yes good footers work well.But I am always for first mass loading a rack or wall mount and then trying different typed cheap and expensive.I always think it weird people will do things like get feet or put dampening mats inside a unit and then have room that is too hard or soft and not treat walls for getting rid of standing waves or have light rack on wood floors.They might be worth it but down the line compared to other much more effect room treatments (analogue like a diffuser behind speakers or on side walls where those standing waves reflect off ) or if one like the sound putting money into digital E.Q or simply experimenting with placement.That said if it's all set up the way you can given room might not lend itself for a "best" placement of speakers etc it might do trick.On other hand like wire it might change sound (as noted above) but not be better.
Chazz
Chazz