Heavy duty amp stand, Sonic benefits?

Mostly I have found that stands save the amp from collisions with the vacuum cleaner.  And can look good.

Yes, and well isolated from your main rack. I use a mapleshade custom 4in thick maple wood amp stand with spiked footers for my 114lb McIntosh MC 500 and it serves it well.

If it looks so it must sound so.... whatever works for you.  

You all are going to think I am crazy. I have a cabinet (cherry and walnut if you think it matters) to house all of my components and have been using it for years. Some time ago someone mentioned using silicone lab-bottle stoppers to isolate components. I bought some, they were cheap, maybe $20 for a bag full from Amazon. But I never got around to trying them. Until recently. I put three under each amp. Wow! The difference was unmistakable. Much more depth and subtlety. I added them to the rest of my components, but can't say I noticed a difference there. It could be because my amps are on the bottom shelf, perhaps 6 inches from the floor, and I am assuming they are subject to more low frequency vibration because of their location. Or perhaps these amps (AGD Tempo) are more susceptible to vibration. No idea, but for me this works. I mentioned it to an audiophile friend who uses a completely different type of amp. His reply a week later was "It works!"

@emergingsoul 

Keeping vibration from all of your electronics is beneficial, especially tube equipment, but wether  you can hear the difference is another story.  For me, with my equipment, I could not hear a difference, but I put Isoacoustics Gaia feet on my speakers and it made a huge difference!

All the best.